165438604 has 12 divisors (see below), whose sum is σ = 289685704. Its totient is φ = 82671264.

The previous prime is 165438589. The next prime is 165438607. The reversal of 165438604 is 406834561.

It is a happy number.

165438604 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

165438604 is strictly pandigital in base 9.

It is not an unprimeable number, because it can be changed into a prime (165438607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3609 + ... + 18544.

Almost surely, 2^165438604 is an apocalyptic number.

It is an amenable number.

165438604 is a deficient number, since it is larger than the sum of its proper divisors (124247100).

165438604 is a wasteful number, since it uses less digits than its factorization.

165438604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24024 (or 24022 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 165438604 is about 12862.2938856178. The cubic root of 165438604 is about 548.9662167902.

The spelling of 165438604 in words is "one hundred sixty-five million, four hundred thirty-eight thousand, six hundred four".