165857140 has 48 divisors (see below), whose sum is σ = 370355328. Its totient is φ = 62251904.

The previous prime is 165857123. The next prime is 165857173. The reversal of 165857140 is 41758561.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 165857140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20979 + ... + 27781.

It is an arithmetic number, because the mean of its divisors is an integer number (7715736).

Almost surely, 2^165857140 is an apocalyptic number.

165857140 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 165857140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185177664).

165857140 is an abundant number, since it is smaller than the sum of its proper divisors (204498188).

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

165857140 is a wasteful number, since it uses less digits than its factorization.

165857140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6888 (or 6886 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 165857140 is about 12878.5534902022. The cubic root of 165857140 is about 549.4287622818.

The spelling of 165857140 in words is "one hundred sixty-five million, eight hundred fifty-seven thousand, one hundred forty".