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201930 = 23553127
BaseRepresentation
bin110001010011001010
3101020222220
4301103022
522430210
64154510
71500501
oct612312
9336886
10201930
11128793
1298a36
1370bb1
1453838
153ec70
hex314ca

201930 has 32 divisors (see below), whose sum is σ = 497664. Its totient is φ = 52416.

The previous prime is 201923. The next prime is 201937. The reversal of 201930 is 39102.

201930 is a nontrivial binomial coefficient, being equal to C(636, 2).

It is an interprime number because it is at equal distance from previous prime (201923) and next prime (201937).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201937) by changing a digit.

201930 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1527 + ... + 1653.

It is an arithmetic number, because the mean of its divisors is an integer number (15552).

2201930 is an apocalyptic number.

201930 is the 635-th triangular number and also the 318-th hexagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248832).

201930 is an abundant number, since it is smaller than the sum of its proper divisors (295734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201930 is a wasteful number, since it uses less digits than its factorization.

201930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 201930 is about 449.3662203593. The cubic root of 201930 is about 58.6678647023.

The spelling of 201930 in words is "two hundred one thousand, nine hundred thirty".

Divisors: 1 2 3 5 6 10 15 30 53 106 127 159 254 265 318 381 530 635 762 795 1270 1590 1905 3810 6731 13462 20193 33655 40386 67310 100965 201930