399334516 has 36 divisors (see below), whose sum is σ = 817699428. Its totient is φ = 170139648.

The previous prime is 399334511. The next prime is 399334519. The reversal of 399334516 is 615433993.

It can be written as a sum of positive squares in 2 ways, for example, as 326163600 + 73170916 = 18060^2 + 8554^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399334511) 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 11 ways as a sum of consecutive naturals, for example, 28020 + ... + 39796.

It is an arithmetic number, because the mean of its divisors is an integer number (22713873).

Almost surely, 2^399334516 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 399334516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (408849714).

399334516 is an abundant number, since it is smaller than the sum of its proper divisors (418364912).

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

399334516 is a wasteful number, since it uses less digits than its factorization.

399334516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11968 (or 11959 counting only the distinct ones).

The product of its digits is 262440, while the sum is 43.

The square root of 399334516 is about 19983.3559744103. The cubic root of 399334516 is about 736.3974622455.

The spelling of 399334516 in words is "three hundred ninety-nine million, three hundred thirty-four thousand, five hundred sixteen".