399138516 has 180 divisors, whose sum is σ = 1254481536. Its totient is φ = 110224800.

The previous prime is 399138511. The next prime is 399138577. The reversal of 399138516 is 615831993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399138511) by changing a digit.

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 59 ways as a sum of consecutive naturals, for example, 491751 + ... + 492561.

Almost surely, 2^399138516 is an apocalyptic number.

399138516 is a gapful number since it is divisible by the number (36) 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 399138516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (627240768).

399138516 is an abundant number, since it is smaller than the sum of its proper divisors (855343020).

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

399138516 is a wasteful number, since it uses less digits than its factorization.

399138516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872 (or 854 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 399138516 is about 19978.4512913289. The cubic root of 399138516 is about 736.2769638354.

The spelling of 399138516 in words is "three hundred ninety-nine million, one hundred thirty-eight thousand, five hundred sixteen".