399015349 has 2 divisors, whose sum is σ = 399015350. Its totient is φ = 399015348.

The previous prime is 399015329. The next prime is 399015367. The reversal of 399015349 is 943510993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 390852900 + 8162449 = 19770^2 + 2857^2 .

It is a cyclic number.

It is not a de Polignac number, because 399015349 - 2²³ = 390626741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399015329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199507674 + 199507675.

It is an arithmetic number, because the mean of its divisors is an integer number (199507675).

Almost surely, 2^399015349 is an apocalyptic number.

It is an amenable number.

399015349 is a deficient number, since it is larger than the sum of its proper divisors (1).

399015349 is an equidigital number, since it uses as much as digits as its factorization.

399015349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131220, while the sum is 43.

The square root of 399015349 is about 19975.3685573008. The cubic root of 399015349 is about 736.2012220810.

The spelling of 399015349 in words is "three hundred ninety-nine million, fifteen thousand, three hundred forty-nine".