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191490 = 23513491
BaseRepresentation
bin101110110000000010
3100201200020
4232300002
522111430
64034310
71425165
oct566002
9321606
10191490
11120962
1292996
1369210
144dadc
153bb10
hex2ec02

191490 has 32 divisors (see below), whose sum is σ = 495936. Its totient is φ = 47040.

The previous prime is 191473. The next prime is 191491. The reversal of 191490 is 94191.

It is a self number, because there is not a number n which added to its sum of digits gives 191490.

It is not an unprimeable number, because it can be changed into a prime (191491) by changing a digit.

191490 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145 + ... + 635.

It is an arithmetic number, because the mean of its divisors is an integer number (15498).

2191490 is an apocalyptic number.

191490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 191490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247968).

191490 is an abundant number, since it is smaller than the sum of its proper divisors (304446).

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

191490 is a wasteful number, since it uses less digits than its factorization.

191490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 191490 is about 437.5957038180. The cubic root of 191490 is about 57.6388578464.

The spelling of 191490 in words is "one hundred ninety-one thousand, four hundred ninety".

Divisors: 1 2 3 5 6 10 13 15 26 30 39 65 78 130 195 390 491 982 1473 2455 2946 4910 6383 7365 12766 14730 19149 31915 38298 63830 95745 191490