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389780 = 22519489
BaseRepresentation
bin1011111001010010100
3201210200022
41133022110
544433110
612204312
73212246
oct1371224
9653608
10389780
11246936
12169698
13108551
14a2096
157a755
hex5f294

389780 has 12 divisors (see below), whose sum is σ = 818580. Its totient is φ = 155904.

The previous prime is 389773. The next prime is 389783. The reversal of 389780 is 87983.

It can be written as a sum of positive squares in 2 ways, for example, as 55696 + 334084 = 236^2 + 578^2 .

It is a nialpdrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 389780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9725 + ... + 9764.

It is an arithmetic number, because the mean of its divisors is an integer number (68215).

2389780 is an apocalyptic number.

It is an amenable number.

389780 is an abundant number, since it is smaller than the sum of its proper divisors (428800).

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

389780 is a wasteful number, since it uses less digits than its factorization.

389780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19498 (or 19496 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 389780 is about 624.3236340233. The cubic root of 389780 is about 73.0476951088.

The spelling of 389780 in words is "three hundred eighty-nine thousand, seven hundred eighty".

Divisors: 1 2 4 5 10 20 19489 38978 77956 97445 194890 389780