399338291 has 16 divisors (see below), whose sum is σ = 452462208. Its totient is φ = 349272000.

The previous prime is 399338281. The next prime is 399338339. The reversal of 399338291 is 192833993.

It is not a de Polignac number, because 399338291 - 2¹⁸ = 399076147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399338201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25391 + ... + 37991.

It is an arithmetic number, because the mean of its divisors is an integer number (28278888).

Almost surely, 2^399338291 is an apocalyptic number.

399338291 is a deficient number, since it is larger than the sum of its proper divisors (53123917).

399338291 is a wasteful number, since it uses less digits than its factorization.

399338291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12722.

The product of its digits is 314928, while the sum is 47.

The square root of 399338291 is about 19983.4504277915. The cubic root of 399338291 is about 736.3997826825.

The spelling of 399338291 in words is "three hundred ninety-nine million, three hundred thirty-eight thousand, two hundred ninety-one".