165904290 has 48 divisors (see below), whose sum is σ = 450111168. Its totient is φ = 42317088.

The previous prime is 165904289. The next prime is 165904357. The reversal of 165904290 is 92409561.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38004 + ... + 42143.

It is an arithmetic number, because the mean of its divisors is an integer number (9377316).

Almost surely, 2^165904290 is an apocalyptic number.

165904290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165904290 is an abundant number, since it is smaller than the sum of its proper divisors (284206878).

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

165904290 is a wasteful number, since it uses less digits than its factorization.

165904290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80183 (or 80180 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 165904290 is about 12880.3839228495. The cubic root of 165904290 is about 549.4808213645.

The spelling of 165904290 in words is "one hundred sixty-five million, nine hundred four thousand, two hundred ninety".