399635716480 has 1024 divisors, whose sum is σ = 1330027776000. Its totient is φ = 110839726080.

The previous prime is 399635716409. The next prime is 399635716481. The reversal of 399635716480 is 84617536993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399635716481) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3666382666 + ... + 3666382774.

It is an arithmetic number, because the mean of its divisors is an integer number (1298855250).

Almost surely, 2^399635716480 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399635716480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (665013888000).

399635716480 is an abundant number, since it is smaller than the sum of its proper divisors (930392059520).

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

399635716480 is a wasteful number, since it uses less digits than its factorization.

399635716480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 61.

The spelling of 399635716480 in words is "three hundred ninety-nine billion, six hundred thirty-five million, seven hundred sixteen thousand, four hundred eighty".