399703840 has 48 divisors (see below), whose sum is σ = 946233792. Its totient is φ = 159554304.

The previous prime is 399703831. The next prime is 399703849. The reversal of 399703840 is 48307993.

399703840 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (399703831) and next prime (399703849).

It is not an unprimeable number, because it can be changed into a prime (399703849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85237 + ... + 89803.

It is an arithmetic number, because the mean of its divisors is an integer number (19713204).

Almost surely, 2^399703840 is an apocalyptic number.

It is an amenable number.

399703840 is an abundant number, since it is smaller than the sum of its proper divisors (546529952).

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

399703840 is a wasteful number, since it uses less digits than its factorization.

399703840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5129 (or 5121 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 399703840 is about 19992.5946290120. The cubic root of 399703840 is about 736.6244110358.

The spelling of 399703840 in words is "three hundred ninety-nine million, seven hundred three thousand, eight hundred forty".