165039400 has 48 divisors (see below), whose sum is σ = 406296540. Its totient is φ = 62131200.

The previous prime is 165039397. The next prime is 165039463. The reversal of 165039400 is 4930561.

It can be written as a sum of positive squares in 6 ways, for example, as 32467204 + 132572196 = 5698^2 + 11514^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20871 + ... + 27670.

Almost surely, 2^165039400 is an apocalyptic number.

165039400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165039400 is an abundant number, since it is smaller than the sum of its proper divisors (241257140).

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

165039400 is a wasteful number, since it uses less digits than its factorization.

165039400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48574 (or 48565 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 165039400 is about 12846.7661300422. The cubic root of 165039400 is about 548.5243086129.

Adding to 165039400 its reverse (4930561), we get a palindrome (169969961).

The spelling of 165039400 in words is "one hundred sixty-five million, thirty-nine thousand, four hundred".