165057839 has 4 divisors (see below), whose sum is σ = 165098856. Its totient is φ = 165016824.

The previous prime is 165057833. The next prime is 165057853. The reversal of 165057839 is 938750561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165057839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165057839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165057833) 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, 13724 + ... + 22769.

It is an arithmetic number, because the mean of its divisors is an integer number (41274714).

Almost surely, 2^165057839 is an apocalyptic number.

165057839 is a deficient number, since it is larger than the sum of its proper divisors (41017).

165057839 is an equidigital number, since it uses as much as digits as its factorization.

165057839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41016.

The product of its (nonzero) digits is 226800, while the sum is 44.

The square root of 165057839 is about 12847.4837614219. The cubic root of 165057839 is about 548.5447357818.

The spelling of 165057839 in words is "one hundred sixty-five million, fifty-seven thousand, eight hundred thirty-nine".