399818280960 has 1248 divisors, whose sum is σ = 1717357824000. Its totient is φ = 87238508544.

The previous prime is 399818280929. The next prime is 399818280991. The reversal of 399818280960 is 69082818993.

399818280960 is a `hidden beast` number, since 399 + 8 + 1 + 82 + 80 + 96 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (399818280929) and next prime (399818280991).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 801238791 + ... + 801239289.

It is an arithmetic number, because the mean of its divisors is an integer number (1376088000).

Almost surely, 2^399818280960 is an apocalyptic number.

399818280960 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 399818280960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (858678912000).

399818280960 is an abundant number, since it is smaller than the sum of its proper divisors (1317539543040).

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

399818280960 is an equidigital number, since it uses as much as digits as its factorization.

399818280960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 63.

The spelling of 399818280960 in words is "three hundred ninety-nine billion, eight hundred eighteen million, two hundred eighty thousand, nine hundred sixty".