165986442 has 32 divisors (see below), whose sum is σ = 369374400. Its totient is φ = 55251504.

The previous prime is 165986441. The next prime is 165986473. The reversal of 165986442 is 244689561.

165986442 is a `hidden beast` number, since 16 + 598 + 6 + 4 + 42 = 666.

It is not an unprimeable number, because it can be changed into a prime (165986441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47284 + ... + 50672.

It is an arithmetic number, because the mean of its divisors is an integer number (11542950).

Almost surely, 2^165986442 is an apocalyptic number.

165986442 is an abundant number, since it is smaller than the sum of its proper divisors (203387958).

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

165986442 is a wasteful number, since it uses less digits than its factorization.

165986442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4307 (or 4301 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 165986442 is about 12883.5725635400. The cubic root of 165986442 is about 549.5715031658.

The spelling of 165986442 in words is "one hundred sixty-five million, nine hundred eighty-six thousand, four hundred forty-two".