165974720 has 56 divisors (see below), whose sum is σ = 396392400. Its totient is φ = 66194432.

The previous prime is 165974701. The next prime is 165974741. The reversal of 165974720 is 27479561.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 162371 + ... + 163389.

Almost surely, 2^165974720 is an apocalyptic number.

165974720 is a gapful number since it is divisible by the number (10) 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 165974720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198196200).

165974720 is an abundant number, since it is smaller than the sum of its proper divisors (230417680).

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

165974720 is a wasteful number, since it uses less digits than its factorization.

165974720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545 (or 1535 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 165974720 is about 12883.1176351068. The cubic root of 165974720 is about 549.5585659067.

The spelling of 165974720 in words is "one hundred sixty-five million, nine hundred seventy-four thousand, seven hundred twenty".