399240056832 has 104 divisors (see below), whose sum is σ = 1079505650880. Its totient is φ = 131205365760.

The previous prime is 399240056827. The next prime is 399240056879. The reversal of 399240056832 is 238650042993.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 643644 + ... + 1101252.

Almost surely, 2^399240056832 is an apocalyptic number.

399240056832 is a gapful number since it is divisible by the number (32) 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 399240056832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (539752825440).

399240056832 is an abundant number, since it is smaller than the sum of its proper divisors (680265594048).

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

399240056832 is an equidigital number, since it uses as much as digits as its factorization.

399240056832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457707 (or 457685 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 51.

The spelling of 399240056832 in words is "three hundred ninety-nine billion, two hundred forty million, fifty-six thousand, eight hundred thirty-two".