399739354560 has 1344 divisors, whose sum is σ = 1858694003712. Its totient is φ = 79355510784.

The previous prime is 399739354519. The next prime is 399739354579. The reversal of 399739354560 is 65453937993.

399739354560 is a `hidden beast` number, since 3 + 9 + 9 + 7 + 39 + 35 + 4 + 560 = 666.

It is a tau number, because it is divible by the number of its divisors (1344).

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 191 ways as a sum of consecutive naturals, for example, 120293059 + ... + 120296381.

It is an arithmetic number, because the mean of its divisors is an integer number (1382956848).

Almost surely, 2^399739354560 is an apocalyptic number.

399739354560 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 399739354560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (929347001856).

399739354560 is an abundant number, since it is smaller than the sum of its proper divisors (1458954649152).

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

399739354560 is a wasteful number, since it uses less digits than its factorization.

399739354560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3392 (or 3370 counting only the distinct ones).

The product of its (nonzero) digits is 82668600, while the sum is 63.

The spelling of 399739354560 in words is "three hundred ninety-nine billion, seven hundred thirty-nine million, three hundred fifty-four thousand, five hundred sixty".