399643600000 has 192 divisors, whose sum is σ = 1003105797120. Its totient is φ = 158578560000.

The previous prime is 399643599973. The next prime is 399643600019. The reversal of 399643600000 is 6346993.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50796067 + ... + 50803933.

It is an arithmetic number, because the mean of its divisors is an integer number (5224509360).

Almost surely, 2^399643600000 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 399643600000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (501552898560).

399643600000 is an abundant number, since it is smaller than the sum of its proper divisors (603462197120).

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

399643600000 is an frugal number, since it uses more digits than its factorization.

399643600000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8033 (or 8001 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 40.

Adding to 399643600000 its reverse (6346993), we get a palindrome (399649946993).

The spelling of 399643600000 in words is "three hundred ninety-nine billion, six hundred forty-three million, six hundred thousand".