399855641240 has 128 divisors (see below), whose sum is σ = 1059452006400. Its totient is φ = 134284254720.

The previous prime is 399855641239. The next prime is 399855641257. The reversal of 399855641240 is 42146558993.

It is a congruent number.

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, 387752 + ... + 974711.

It is an arithmetic number, because the mean of its divisors is an integer number (8276968800).

Almost surely, 2^399855641240 is an apocalyptic number.

It is an amenable number.

399855641240 is an abundant number, since it is smaller than the sum of its proper divisors (659596365160).

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

399855641240 is a wasteful number, since it uses less digits than its factorization.

399855641240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362537 (or 1362533 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 56.

The spelling of 399855641240 in words is "three hundred ninety-nine billion, eight hundred fifty-five million, six hundred forty-one thousand, two hundred forty".