165989376 has 264 divisors, whose sum is σ = 572242944. Its totient is φ = 45342720.

The previous prime is 165989353. The next prime is 165989387. The reversal of 165989376 is 673989561.

165989376 is a `hidden beast` number, since 16 + 598 + 9 + 37 + 6 = 666.

Its product of digits (2449440) is a multiple of the sum of its prime divisors (126).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1999831 + ... + 1999913.

Almost surely, 2^165989376 is an apocalyptic number.

165989376 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165989376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286121472).

165989376 is an abundant number, since it is smaller than the sum of its proper divisors (406253568).

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

165989376 is a wasteful number, since it uses less digits than its factorization.

165989376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 126 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 165989376 is about 12883.6864289690. The cubic root of 165989376 is about 549.5747412481.

The spelling of 165989376 in words is "one hundred sixty-five million, nine hundred eighty-nine thousand, three hundred seventy-six".