399240617955 has 16 divisors (see below), whose sum is σ = 643661213184. Its totient is φ = 211302921440.

The previous prime is 399240617929. The next prime is 399240617989. The reversal of 399240617955 is 559716042993.

It is not a de Polignac number, because 399240617955 - 2³³ = 390650683363 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101585979 + ... + 101589908.

It is an arithmetic number, because the mean of its divisors is an integer number (40228825824).

Almost surely, 2^399240617955 is an apocalyptic number.

399240617955 is a deficient number, since it is larger than the sum of its proper divisors (244420595229).

399240617955 is a wasteful number, since it uses less digits than its factorization.

399240617955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203176026.

The product of its (nonzero) digits is 18370800, while the sum is 60.

The spelling of 399240617955 in words is "three hundred ninety-nine billion, two hundred forty million, six hundred seventeen thousand, nine hundred fifty-five".