399234881 has 8 divisors (see below), whose sum is σ = 402468264. Its totient is φ = 396014080.

The previous prime is 399234877. The next prime is 399234889. The reversal of 399234881 is 188432993.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 152744881 + 246490000 = 12359^2 + 15700^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399234881 - 2² = 399234877 is a prime.

It is a super-2 number, since 2×399234881² = 318776980414168322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399234889) 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 7 ways as a sum of consecutive naturals, for example, 66671 + ... + 72411.

It is an arithmetic number, because the mean of its divisors is an integer number (50308533).

Almost surely, 2^399234881 is an apocalyptic number.

It is an amenable number.

399234881 is a deficient number, since it is larger than the sum of its proper divisors (3233383).

399234881 is a wasteful number, since it uses less digits than its factorization.

399234881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6291.

The product of its digits is 373248, while the sum is 47.

The square root of 399234881 is about 19980.8628692557. The cubic root of 399234881 is about 736.3362127908.

The spelling of 399234881 in words is "three hundred ninety-nine million, two hundred thirty-four thousand, eight hundred eighty-one".