165305399 has 24 divisors (see below), whose sum is σ = 205685088. Its totient is φ = 130037760.

The previous prime is 165305383. The next prime is 165305401. The reversal of 165305399 is 993503561.

It is not a de Polignac number, because 165305399 - 2⁴ = 165305383 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165305369) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81947 + ... + 83939.

It is an arithmetic number, because the mean of its divisors is an integer number (8570212).

Almost surely, 2^165305399 is an apocalyptic number.

165305399 is a deficient number, since it is larger than the sum of its proper divisors (40379689).

165305399 is a wasteful number, since it uses less digits than its factorization.

165305399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2075 (or 2058 counting only the distinct ones).

The product of its (nonzero) digits is 109350, while the sum is 41.

The square root of 165305399 is about 12857.1147229851. The cubic root of 165305399 is about 548.8188415146.

The spelling of 165305399 in words is "one hundred sixty-five million, three hundred five thousand, three hundred ninety-nine".