399755022820 has 12 divisors (see below), whose sum is σ = 839485547964. Its totient is φ = 159902009120.

The previous prime is 399755022809. The next prime is 399755022839. The reversal of 399755022820 is 28220557993.

It can be written as a sum of positive squares in 2 ways, for example, as 269358924004 + 130396098816 = 518998^2 + 361104^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9993875551 + ... + 9993875590.

It is an arithmetic number, because the mean of its divisors is an integer number (69957128997).

Almost surely, 2^399755022820 is an apocalyptic number.

It is an amenable number.

399755022820 is an abundant number, since it is smaller than the sum of its proper divisors (439730525144).

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

399755022820 is a wasteful number, since it uses less digits than its factorization.

399755022820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19987751150 (or 19987751148 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 52.

The spelling of 399755022820 in words is "three hundred ninety-nine billion, seven hundred fifty-five million, twenty-two thousand, eight hundred twenty".