423859979 has 2 divisors, whose sum is σ = 423859980. Its totient is φ = 423859978.

The previous prime is 423859913. The next prime is 423859991. The reversal of 423859979 is 979958324.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423859979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (423859879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211929989 + 211929990.

It is an arithmetic number, because the mean of its divisors is an integer number (211929990).

Almost surely, 2^423859979 is an apocalyptic number.

423859979 is a deficient number, since it is larger than the sum of its proper divisors (1).

423859979 is an equidigital number, since it uses as much as digits as its factorization.

423859979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 56.

The square root of 423859979 is about 20587.8599907810. The cubic root of 423859979 is about 751.1744438009.

The spelling of 423859979 in words is "four hundred twenty-three million, eight hundred fifty-nine thousand, nine hundred seventy-nine".