399644098560 has 952 divisors, whose sum is σ = 1650362146560. Its totient is φ = 90965016576.

The previous prime is 399644098493. The next prime is 399644098583. The reversal of 399644098560 is 65890446993.

399644098560 is a `hidden beast` number, since 3 + 9 + 9 + 64 + 4 + 0 + 9 + 8 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1672150921 + ... + 1672151159.

Almost surely, 2^399644098560 is an apocalyptic number.

399644098560 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399644098560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (825181073280).

399644098560 is an abundant number, since it is smaller than the sum of its proper divisors (1250718048000).

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

399644098560 is an frugal number, since it uses more digits than its factorization.

399644098560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 50388480, while the sum is 63.

The spelling of 399644098560 in words is "three hundred ninety-nine billion, six hundred forty-four million, ninety-eight thousand, five hundred sixty".