394777613 has 2 divisors, whose sum is σ = 394777614. Its totient is φ = 394777612.

The previous prime is 394777597. The next prime is 394777619. The reversal of 394777613 is 316777493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 389746564 + 5031049 = 19742^2 + 2243^2 .

It is an emirp because it is prime and its reverse (316777493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 394777613 - 2⁴ = 394777597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394777619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197388806 + 197388807.

It is an arithmetic number, because the mean of its divisors is an integer number (197388807).

Almost surely, 2^394777613 is an apocalyptic number.

It is an amenable number.

394777613 is a deficient number, since it is larger than the sum of its proper divisors (1).

394777613 is an equidigital number, since it uses as much as digits as its factorization.

394777613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 666792, while the sum is 47.

The square root of 394777613 is about 19869.0113744997. The cubic root of 394777613 is about 733.5856696133.

The spelling of 394777613 in words is "three hundred ninety-four million, seven hundred seventy-seven thousand, six hundred thirteen".