399684516 has 48 divisors (see below), whose sum is σ = 1162721280. Its totient is φ = 103813920.

The previous prime is 399684511. The next prime is 399684533. The reversal of 399684516 is 615486993.

It is not an unprimeable number, because it can be changed into a prime (399684511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215356 + ... + 217203.

It is an arithmetic number, because the mean of its divisors is an integer number (24223360).

Almost surely, 2^399684516 is an apocalyptic number.

It is an amenable number.

399684516 is an abundant number, since it is smaller than the sum of its proper divisors (763036764).

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

399684516 is a wasteful number, since it uses less digits than its factorization.

399684516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432584 (or 432582 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 51.

The square root of 399684516 is about 19992.1113442278. Note that the first 3 decimals coincide. The cubic root of 399684516 is about 736.6125399468.

The spelling of 399684516 in words is "three hundred ninety-nine million, six hundred eighty-four thousand, five hundred sixteen".