399081246720 has 416 divisors, whose sum is σ = 1397841199104. Its totient is φ = 96613171200.

The previous prime is 399081246709. The next prime is 399081246763. The reversal of 399081246720 is 27642180993.

It is a tau number, because it is divible by the number of its divisors (416).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48717825 + ... + 48726015.

Almost surely, 2^399081246720 is an apocalyptic number.

399081246720 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 399081246720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (698920599552).

399081246720 is an abundant number, since it is smaller than the sum of its proper divisors (998759952384).

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

399081246720 is a wasteful number, since it uses less digits than its factorization.

399081246720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8297 (or 8275 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 51.

The spelling of 399081246720 in words is "three hundred ninety-nine billion, eighty-one million, two hundred forty-six thousand, seven hundred twenty".