165703872 has 42 divisors (see below), whose sum is σ = 438897268. Its totient is φ = 55175168.

The previous prime is 165703861. The next prime is 165703903. The reversal of 165703872 is 278307561.

It is a self number, because there is not a number n which added to its sum of digits gives 165703872.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 177904 + ... + 178832.

Almost surely, 2^165703872 is an apocalyptic number.

165703872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

165703872 is an abundant number, since it is smaller than the sum of its proper divisors (273193396).

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

165703872 is an frugal number, since it uses more digits than its factorization.

165703872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1873 (or 934 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 165703872 is about 12872.6016018519. The cubic root of 165703872 is about 549.2594683939.

It can be divided in two parts, 1657038 and 72, that added together give a triangular number (1657110 = T₁₈₂₀).

The spelling of 165703872 in words is "one hundred sixty-five million, seven hundred three thousand, eight hundred seventy-two".