399142976 has 56 divisors (see below), whose sum is σ = 824956440. Its totient is φ = 191434752.

The previous prime is 399142973. The next prime is 399142987. The reversal of 399142976 is 679241993.

It can be written as a sum of positive squares in 4 ways, for example, as 220225600 + 178917376 = 14840^2 + 13376^2 .

It is not an unprimeable number, because it can be changed into a prime (399142973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171710 + ... + 174018.

It is an arithmetic number, because the mean of its divisors is an integer number (14731365).

Almost surely, 2^399142976 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 399142976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (412478220).

399142976 is an abundant number, since it is smaller than the sum of its proper divisors (425813464).

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

399142976 is a wasteful number, since it uses less digits than its factorization.

399142976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2431 (or 2421 counting only the distinct ones).

The product of its digits is 734832, while the sum is 50.

The square root of 399142976 is about 19978.5629112807. The cubic root of 399142976 is about 736.2797062276.

The spelling of 399142976 in words is "three hundred ninety-nine million, one hundred forty-two thousand, nine hundred seventy-six".