165909942 has 24 divisors (see below), whose sum is σ = 392151240. Its totient is φ = 50275680.

The previous prime is 165909929. The next prime is 165909967. The reversal of 165909942 is 249909561.

165909942 is a `hidden beast` number, since 16 + 590 + 9 + 9 + 42 = 666.

It is a super-2 number, since 2×165909942² = 55052217708886728, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 418767 + ... + 419162.

It is an arithmetic number, because the mean of its divisors is an integer number (16339635).

Almost surely, 2^165909942 is an apocalyptic number.

165909942 is an abundant number, since it is smaller than the sum of its proper divisors (226241298).

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

165909942 is a wasteful number, since it uses less digits than its factorization.

165909942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837948 (or 837945 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 165909942 is about 12880.6033243789. The cubic root of 165909942 is about 549.4870611677.

The spelling of 165909942 in words is "one hundred sixty-five million, nine hundred nine thousand, nine hundred forty-two".