123813979 has 2 divisors, whose sum is σ = 123813980. Its totient is φ = 123813978.

The previous prime is 123813971. The next prime is 123814003. The reversal of 123813979 is 979318321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123813979 - 2³ = 123813971 is a prime.

It is not a weakly prime, because it can be changed into another prime (123813971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61906989 + 61906990.

It is an arithmetic number, because the mean of its divisors is an integer number (61906990).

Almost surely, 2^123813979 is an apocalyptic number.

123813979 is a deficient number, since it is larger than the sum of its proper divisors (1).

123813979 is an equidigital number, since it uses as much as digits as its factorization.

123813979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 43.

The square root of 123813979 is about 11127.1730012614. The cubic root of 123813979 is about 498.4136107280.

The spelling of 123813979 in words is "one hundred twenty-three million, eight hundred thirteen thousand, nine hundred seventy-nine".