399411013 has 2 divisors, whose sum is σ = 399411014. Its totient is φ = 399411012.

The previous prime is 399411007. The next prime is 399411017. The reversal of 399411013 is 310114993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 248440644 + 150970369 = 15762^2 + 12287^2 .

It is an emirp because it is prime and its reverse (310114993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399411013 - 2¹⁷ = 399279941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399411017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199705506 + 199705507.

It is an arithmetic number, because the mean of its divisors is an integer number (199705507).

Almost surely, 2^399411013 is an apocalyptic number.

It is an amenable number.

399411013 is a deficient number, since it is larger than the sum of its proper divisors (1).

399411013 is an equidigital number, since it uses as much as digits as its factorization.

399411013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 399411013 is about 19985.2699006043. The cubic root of 399411013 is about 736.4444809711. Note that the first 4 decimals are identical.

The spelling of 399411013 in words is "three hundred ninety-nine million, four hundred eleven thousand, thirteen".