399830722560 has 672 divisors, whose sum is σ = 1514622564000. Its totient is φ = 100974034944.

The previous prime is 399830722547. The next prime is 399830722561. The reversal of 399830722560 is 65227038993.

It is a happy number.

399830722560 is a `hidden beast` number, since 3 + 9 + 9 + 8 + 3 + 0 + 72 + 2 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 399830722497 and 399830722506.

It is not an unprimeable number, because it can be changed into a prime (399830722561) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 141832831 + ... + 141835649.

It is an arithmetic number, because the mean of its divisors is an integer number (2253902625).

Almost surely, 2^399830722560 is an apocalyptic number.

399830722560 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 399830722560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (757311282000).

399830722560 is an abundant number, since it is smaller than the sum of its proper divisors (1114791841440).

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

399830722560 is an equidigital number, since it uses as much as digits as its factorization.

399830722560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2883 (or 2848 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 54.

The spelling of 399830722560 in words is "three hundred ninety-nine billion, eight hundred thirty million, seven hundred twenty-two thousand, five hundred sixty".