399696388560 has 480 divisors, whose sum is σ = 1569125855232. Its totient is φ = 89277742080.

The previous prime is 399696388549. The next prime is 399696388561. The reversal of 399696388560 is 65883696993.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399696388561) 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 95 ways as a sum of consecutive naturals, for example, 305811427 + ... + 305812733.

Almost surely, 2^399696388560 is an apocalyptic number.

399696388560 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 399696388560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (784562927616).

399696388560 is an abundant number, since it is smaller than the sum of its proper divisors (1169429466672).

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

399696388560 is a wasteful number, since it uses less digits than its factorization.

399696388560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671 (or 2662 counting only the distinct ones).

The product of its (nonzero) digits is 453496320, while the sum is 72.

The spelling of 399696388560 in words is "three hundred ninety-nine billion, six hundred ninety-six million, three hundred eighty-eight thousand, five hundred sixty".