399641616720 has 200 divisors, whose sum is σ = 1388386137600. Its totient is φ = 106542570240.

The previous prime is 399641616713. The next prime is 399641616727. The reversal of 399641616720 is 27616146993.

399641616720 is a `hidden beast` number, since 399 + 64 + 16 + 167 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (399641616713) and next prime (399641616727).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399641616727) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 37001881 + ... + 37012679.

It is an arithmetic number, because the mean of its divisors is an integer number (6941930688).

Almost surely, 2^399641616720 is an apocalyptic number.

399641616720 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 399641616720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (694193068800).

399641616720 is an abundant number, since it is smaller than the sum of its proper divisors (988744520880).

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

399641616720 is a wasteful number, since it uses less digits than its factorization.

399641616720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16535 (or 16520 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The spelling of 399641616720 in words is "three hundred ninety-nine billion, six hundred forty-one million, six hundred sixteen thousand, seven hundred twenty".