399471968 has 48 divisors (see below), whose sum is σ = 907762464. Its totient is φ = 169497600.

The previous prime is 399471959. The next prime is 399471991. The reversal of 399471968 is 869174993.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

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, 13796 + ... + 31452.

It is an arithmetic number, because the mean of its divisors is an integer number (18911718).

Almost surely, 2^399471968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399471968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (453881232).

399471968 is an abundant number, since it is smaller than the sum of its proper divisors (508290496).

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

399471968 is a wasteful number, since it uses less digits than its factorization.

399471968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17775 (or 17767 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 56.

The square root of 399471968 is about 19986.7948405941. The cubic root of 399471968 is about 736.4819425403.

The spelling of 399471968 in words is "three hundred ninety-nine million, four hundred seventy-one thousand, nine hundred sixty-eight".