399663299672 has 32 divisors (see below), whose sum is σ = 922299924000. Its totient is φ = 158108557824.

The previous prime is 399663299653. The next prime is 399663299677. The reversal of 399663299672 is 276992366993.

It is a junction number, because it is equal to n+sod(n) for n = 399663299596 and 399663299605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399663299677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274493297 + ... + 274494752.

It is an arithmetic number, because the mean of its divisors is an integer number (28821872625).

Almost surely, 2^399663299672 is an apocalyptic number.

It is an amenable number.

399663299672 is an abundant number, since it is smaller than the sum of its proper divisors (522636624328).

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

399663299672 is a wasteful number, since it uses less digits than its factorization.

399663299672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548988075 (or 548988071 counting only the distinct ones).

The product of its digits is 357128352, while the sum is 71.

The spelling of 399663299672 in words is "three hundred ninety-nine billion, six hundred sixty-three million, two hundred ninety-nine thousand, six hundred seventy-two".