399570079 has 2 divisors, whose sum is σ = 399570080. Its totient is φ = 399570078.

The previous prime is 399570013. The next prime is 399570103. The reversal of 399570079 is 970075993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 399570079 - 2⁹ = 399569567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399570979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199785039 + 199785040.

It is an arithmetic number, because the mean of its divisors is an integer number (199785040).

Almost surely, 2^399570079 is an apocalyptic number.

399570079 is a deficient number, since it is larger than the sum of its proper divisors (1).

399570079 is an equidigital number, since it uses as much as digits as its factorization.

399570079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 535815, while the sum is 49.

The square root of 399570079 is about 19989.2490854459. The cubic root of 399570079 is about 736.5422313474.

The spelling of 399570079 in words is "three hundred ninety-nine million, five hundred seventy thousand, seventy-nine".