165390738 has 16 divisors (see below), whose sum is σ = 330910176. Its totient is φ = 55108800.

The previous prime is 165390713. The next prime is 165390749. The reversal of 165390738 is 837093561.

It is a self number, because there is not a number n which added to its sum of digits gives 165390738.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22413 + ... + 28863.

It is an arithmetic number, because the mean of its divisors is an integer number (20681886).

Almost surely, 2^165390738 is an apocalyptic number.

165390738 is an abundant number, since it is smaller than the sum of its proper divisors (165519438).

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

165390738 is a wasteful number, since it uses less digits than its factorization.

165390738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10729.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 165390738 is about 12860.4330409205. The cubic root of 165390738 is about 548.9132679400.

The spelling of 165390738 in words is "one hundred sixty-five million, three hundred ninety thousand, seven hundred thirty-eight".