399370319 has 2 divisors, whose sum is σ = 399370320. Its totient is φ = 399370318.

The previous prime is 399370277. The next prime is 399370333. The reversal of 399370319 is 913073993.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399370319 is a prime.

It is a super-2 number, since 2×399370319² = 318993303396323522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 399370319.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399370379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199685159 + 199685160.

It is an arithmetic number, because the mean of its divisors is an integer number (199685160).

Almost surely, 2^399370319 is an apocalyptic number.

399370319 is a deficient number, since it is larger than the sum of its proper divisors (1).

399370319 is an equidigital number, since it uses as much as digits as its factorization.

399370319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 137781, while the sum is 44.

The square root of 399370319 is about 19984.2517748351. The cubic root of 399370319 is about 736.4194692342.

The spelling of 399370319 in words is "three hundred ninety-nine million, three hundred seventy thousand, three hundred nineteen".