1390338979 has 2 divisors, whose sum is σ = 1390338980. Its totient is φ = 1390338978.

The previous prime is 1390338959. The next prime is 1390339019. The reversal of 1390338979 is 9798330931.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1390338979 is a prime.

It is not a weakly prime, because it can be changed into another prime (1390338919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695169489 + 695169490.

It is an arithmetic number, because the mean of its divisors is an integer number (695169490).

Almost surely, 2^1390338979 is an apocalyptic number.

1390338979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390338979 is an equidigital number, since it uses as much as digits as its factorization.

1390338979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1102248, while the sum is 52.

The square root of 1390338979 is about 37287.2495499467. The cubic root of 1390338979 is about 1116.1097436539.

The spelling of 1390338979 in words is "one billion, three hundred ninety million, three hundred thirty-eight thousand, nine hundred seventy-nine".