165707440 has 20 divisors (see below), whose sum is σ = 385269984. Its totient is φ = 66282944.

The previous prime is 165707429. The next prime is 165707447. The reversal of 165707440 is 44707561.

It is a happy number.

165707440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 165707396 and 165707405.

It is not an unprimeable number, because it can be changed into a prime (165707447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1035592 + ... + 1035751.

Almost surely, 2^165707440 is an apocalyptic number.

165707440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165707440 is an abundant number, since it is smaller than the sum of its proper divisors (219562544).

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

165707440 is a wasteful number, since it uses less digits than its factorization.

165707440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071356 (or 2071350 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 165707440 is about 12872.7401900295. The cubic root of 165707440 is about 549.2634106548.

The spelling of 165707440 in words is "one hundred sixty-five million, seven hundred seven thousand, four hundred forty".