399473648640 has 1584 divisors, whose sum is σ = 1679926457664. Its totient is φ = 90243072000.

The previous prime is 399473648617. The next prime is 399473648653. The reversal of 399473648640 is 46846374993.

399473648640 is a `hidden beast` number, since 39 + 94 + 7 + 36 + 486 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1584).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3955184590 + ... + 3955184690.

Almost surely, 2^399473648640 is an apocalyptic number.

399473648640 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 399473648640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (839963228832).

399473648640 is an abundant number, since it is smaller than the sum of its proper divisors (1280452809024).

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

399473648640 is a wasteful number, since it uses less digits than its factorization.

399473648640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 94058496, while the sum is 63.

The spelling of 399473648640 in words is "three hundred ninety-nine billion, four hundred seventy-three million, six hundred forty-eight thousand, six hundred forty".