399448706580 has 1728 divisors, whose sum is σ = 1733125766400. Its totient is φ = 75788697600.

The previous prime is 399448706567. The next prime is 399448706617. The reversal of 399448706580 is 85607844993.

399448706580 is a `hidden beast` number, since 3 + 9 + 9 + 4 + 48 + 7 + 0 + 6 + 580 = 666.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 575 ways as a sum of consecutive naturals, for example, 2231556931 + ... + 2231557109.

It is an arithmetic number, because the mean of its divisors is an integer number (1002966300).

Almost surely, 2^399448706580 is an apocalyptic number.

399448706580 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 399448706580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (866562883200).

399448706580 is an abundant number, since it is smaller than the sum of its proper divisors (1333677059820).

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

399448706580 is a wasteful number, since it uses less digits than its factorization.

399448706580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 63.

The spelling of 399448706580 in words is "three hundred ninety-nine billion, four hundred forty-eight million, seven hundred six thousand, five hundred eighty".