399510980 has 24 divisors (see below), whose sum is σ = 915243840. Its totient is φ = 145276640.

The previous prime is 399510973. The next prime is 399510997. The reversal of 399510980 is 89015993.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 907760 + ... + 908199.

It is an arithmetic number, because the mean of its divisors is an integer number (38135160).

Almost surely, 2^399510980 is an apocalyptic number.

It is an amenable number.

399510980 is an abundant number, since it is smaller than the sum of its proper divisors (515732860).

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

399510980 is a wasteful number, since it uses less digits than its factorization.

399510980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1815979 (or 1815977 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 399510980 is about 19987.7707611429. The cubic root of 399510980 is about 736.5059164364.

The spelling of 399510980 in words is "three hundred ninety-nine million, five hundred ten thousand, nine hundred eighty".