399656958 has 8 divisors (see below), whose sum is σ = 799313928. Its totient is φ = 133218984.

The previous prime is 399656953. The next prime is 399657019. The reversal of 399656958 is 859656993.

It is a sphenic number, since it is the product of 3 distinct primes.

399656958 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399656951) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 33304741 + ... + 33304752.

It is an arithmetic number, because the mean of its divisors is an integer number (99914241).

Almost surely, 2^399656958 is an apocalyptic number.

399656958 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

399656958 is a wasteful number, since it uses less digits than its factorization.

399656958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66609498.

The product of its digits is 15746400, while the sum is 60.

The square root of 399656958 is about 19991.4221104953. The cubic root of 399656958 is about 736.5956098982.

The spelling of 399656958 in words is "three hundred ninety-nine million, six hundred fifty-six thousand, nine hundred fifty-eight".