399739213 has 2 divisors, whose sum is σ = 399739214. Its totient is φ = 399739212.

The previous prime is 399739187. The next prime is 399739247. The reversal of 399739213 is 312937993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228705129 + 171034084 = 15123^2 + 13078^2 .

It is a cyclic number.

It is not a de Polignac number, because 399739213 - 2⁵ = 399739181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399734213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199869606 + 199869607.

It is an arithmetic number, because the mean of its divisors is an integer number (199869607).

Almost surely, 2^399739213 is an apocalyptic number.

It is an amenable number.

399739213 is a deficient number, since it is larger than the sum of its proper divisors (1).

399739213 is an equidigital number, since it uses as much as digits as its factorization.

399739213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 275562, while the sum is 46.

The square root of 399739213 is about 19993.4792619994. The cubic root of 399739213 is about 736.6461403297.

The spelling of 399739213 in words is "three hundred ninety-nine million, seven hundred thirty-nine thousand, two hundred thirteen".