399241079 has 2 divisors, whose sum is σ = 399241080. Its totient is φ = 399241078.

The previous prime is 399241049. The next prime is 399241093. The reversal of 399241079 is 970142993.

It is a strong prime.

It is an emirp because it is prime and its reverse (970142993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399241079 - 2²⁰ = 398192503 is a prime.

It is a super-2 number, since 2×399241079² = 318786878322168482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399241009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199620539 + 199620540.

It is an arithmetic number, because the mean of its divisors is an integer number (199620540).

Almost surely, 2^399241079 is an apocalyptic number.

399241079 is a deficient number, since it is larger than the sum of its proper divisors (1).

399241079 is an equidigital number, since it uses as much as digits as its factorization.

399241079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 399241079 is about 19981.0179670606. The cubic root of 399241079 is about 736.3400232363.

The spelling of 399241079 in words is "three hundred ninety-nine million, two hundred forty-one thousand, seventy-nine".