399906238788 has 432 divisors, whose sum is σ = 1229733296064. Its totient is φ = 109164464640.

The previous prime is 399906238757. The next prime is 399906238793. The reversal of 399906238788 is 887832609993.

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 143 ways as a sum of consecutive naturals, for example, 1208175783 + ... + 1208176113.

It is an arithmetic number, because the mean of its divisors is an integer number (2846604852).

Almost surely, 2^399906238788 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 399906238788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (614866648032).

399906238788 is an abundant number, since it is smaller than the sum of its proper divisors (829827057276).

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

399906238788 is a wasteful number, since it uses less digits than its factorization.

399906238788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 282175488, while the sum is 72.

The spelling of 399906238788 in words is "three hundred ninety-nine billion, nine hundred six million, two hundred thirty-eight thousand, seven hundred eighty-eight".