399584915840 has 512 divisors, whose sum is σ = 1105928847360. Its totient is φ = 136744796160.

The previous prime is 399584915801. The next prime is 399584915861. The reversal of 399584915840 is 48519485993.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1554804992 + ... + 1554805248.

It is an arithmetic number, because the mean of its divisors is an integer number (2160017280).

Almost surely, 2^399584915840 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 399584915840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (552964423680).

399584915840 is an abundant number, since it is smaller than the sum of its proper divisors (706343931520).

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

399584915840 is a wasteful number, since it uses less digits than its factorization.

399584915840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 55987200, while the sum is 65.

The spelling of 399584915840 in words is "three hundred ninety-nine billion, five hundred eighty-four million, nine hundred fifteen thousand, eight hundred forty".