399675980 has 48 divisors (see below), whose sum is σ = 920463264. Its totient is φ = 144568320.

The previous prime is 399675979. The next prime is 399676009. The reversal of 399675980 is 89576993.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37754 + ... + 47166.

It is an arithmetic number, because the mean of its divisors is an integer number (19176318).

Almost surely, 2^399675980 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 399675980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (460231632).

399675980 is an abundant number, since it is smaller than the sum of its proper divisors (520787284).

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

399675980 is a wasteful number, since it uses less digits than its factorization.

399675980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9626 (or 9624 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 56.

The square root of 399675980 is about 19991.8978588827. The cubic root of 399675980 is about 736.6072960030.

The spelling of 399675980 in words is "three hundred ninety-nine million, six hundred seventy-five thousand, nine hundred eighty".