399612655 has 32 divisors (see below), whose sum is σ = 546416640. Its totient is φ = 278121600.

The previous prime is 399612643. The next prime is 399612671. The reversal of 399612655 is 556216993.

It is not a de Polignac number, because 399612655 - 2²⁵ = 366058223 is a prime.

It is a super-2 number, since 2×399612655² = 319380548072298050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 274680 + ... + 276130.

It is an arithmetic number, because the mean of its divisors is an integer number (17075520).

Almost surely, 2^399612655 is an apocalyptic number.

399612655 is a deficient number, since it is larger than the sum of its proper divisors (146803985).

399612655 is a wasteful number, since it uses less digits than its factorization.

399612655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1711.

The product of its digits is 437400, while the sum is 46.

The square root of 399612655 is about 19990.3140295494. The cubic root of 399612655 is about 736.5683910541.

The spelling of 399612655 in words is "three hundred ninety-nine million, six hundred twelve thousand, six hundred fifty-five".