399943338 has 32 divisors (see below), whose sum is σ = 827192832. Its totient is φ = 128779200.

The previous prime is 399943337. The next prime is 399943339. The reversal of 399943338 is 833349993.

It is an interprime number because it is at equal distance from previous prime (399943337) and next prime (399943339).

It is a super-2 number, since 2×399943338² = 319909347221164488, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399943333) 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 15 ways as a sum of consecutive naturals, for example, 121320 + ... + 124572.

It is an arithmetic number, because the mean of its divisors is an integer number (25849776).

Almost surely, 2^399943338 is an apocalyptic number.

399943338 is an abundant number, since it is smaller than the sum of its proper divisors (427249494).

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

399943338 is a wasteful number, since it uses less digits than its factorization.

399943338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3950.

The product of its digits is 1889568, while the sum is 51.

The square root of 399943338 is about 19998.5833998311. The cubic root of 399943338 is about 736.7715073197.

The spelling of 399943338 in words is "three hundred ninety-nine million, nine hundred forty-three thousand, three hundred thirty-eight".