393339979 has 2 divisors, whose sum is σ = 393339980. Its totient is φ = 393339978.

The previous prime is 393339971. The next prime is 393340061. The reversal of 393339979 is 979933393.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 393339979 - 2³ = 393339971 is a prime.

It is not a weakly prime, because it can be changed into another prime (393339971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196669989 + 196669990.

It is an arithmetic number, because the mean of its divisors is an integer number (196669990).

Almost surely, 2^393339979 is an apocalyptic number.

393339979 is a deficient number, since it is larger than the sum of its proper divisors (1).

393339979 is an equidigital number, since it uses as much as digits as its factorization.

393339979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3720087, while the sum is 55.

The square root of 393339979 is about 19832.8005838812. The cubic root of 393339979 is about 732.6941039571.

The spelling of 393339979 in words is "three hundred ninety-three million, three hundred thirty-nine thousand, nine hundred seventy-nine".