399520676556 has 36 divisors (see below), whose sum is σ = 1069305341832. Its totient is φ = 125339819904.

The previous prime is 399520676543. The next prime is 399520676557. The reversal of 399520676556 is 655676025993.

399520676556 is a `hidden beast` number, since 3 + 9 + 9 + 5 + 2 + 0 + 6 + 76 + 556 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×399520676556² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 399520676493 and 399520676502.

It is not an unprimeable number, because it can be changed into a prime (399520676557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 326405170 + ... + 326406393.

It is an arithmetic number, because the mean of its divisors is an integer number (29702926162).

Almost surely, 2^399520676556 is an apocalyptic number.

399520676556 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

399520676556 is an abundant number, since it is smaller than the sum of its proper divisors (669784665276).

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

399520676556 is a wasteful number, since it uses less digits than its factorization.

399520676556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652811590 (or 652811585 counting only the distinct ones).

The product of its (nonzero) digits is 91854000, while the sum is 63.

The spelling of 399520676556 in words is "three hundred ninety-nine billion, five hundred twenty million, six hundred seventy-six thousand, five hundred fifty-six".