1389097979 has 2 divisors, whose sum is σ = 1389097980. Its totient is φ = 1389097978.

The previous prime is 1389097973. The next prime is 1389097981. The reversal of 1389097979 is 9797909831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1389097979 - 2²⁸ = 1120662523 is a prime.

Together with 1389097981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1389097973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694548989 + 694548990.

It is an arithmetic number, because the mean of its divisors is an integer number (694548990).

Almost surely, 2^1389097979 is an apocalyptic number.

1389097979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389097979 is an equidigital number, since it uses as much as digits as its factorization.

1389097979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7715736, while the sum is 62.

The square root of 1389097979 is about 37270.6047576371. The cubic root of 1389097979 is about 1115.7775693849. Note that the first 3 decimals are identical.

The spelling of 1389097979 in words is "one billion, three hundred eighty-nine million, ninety-seven thousand, nine hundred seventy-nine".