399360610820 has 24 divisors (see below), whose sum is σ = 838726778904. Its totient is φ = 159731006976.

The previous prime is 399360610769. The next prime is 399360610877. The reversal of 399360610820 is 28016063993.

It can be written as a sum of positive squares in 4 ways, for example, as 18256873924 + 381103736896 = 135118^2 + 617336^2 .

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 578117 + ... + 1064396.

It is an arithmetic number, because the mean of its divisors is an integer number (34946949121).

Almost surely, 2^399360610820 is an apocalyptic number.

It is an amenable number.

399360610820 is an abundant number, since it is smaller than the sum of its proper divisors (439366168084).

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

399360610820 is a wasteful number, since it uses less digits than its factorization.

399360610820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654679 (or 1654677 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 47.

The spelling of 399360610820 in words is "three hundred ninety-nine billion, three hundred sixty million, six hundred ten thousand, eight hundred twenty".