399712390 has 32 divisors (see below), whose sum is σ = 897018624. Its totient is φ = 124585440.

The previous prime is 399712387. The next prime is 399712399. The reversal of 399712390 is 93217993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399712399) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 258784 + ... + 260323.

It is an arithmetic number, because the mean of its divisors is an integer number (28031832).

Almost surely, 2^399712390 is an apocalyptic number.

399712390 is an abundant number, since it is smaller than the sum of its proper divisors (497306234).

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

399712390 is a wasteful number, since it uses less digits than its factorization.

399712390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519132.

The product of its (nonzero) digits is 91854, while the sum is 43.

The square root of 399712390 is about 19992.8084570427. The cubic root of 399712390 is about 736.6296633361.

The spelling of 399712390 in words is "three hundred ninety-nine million, seven hundred twelve thousand, three hundred ninety".