30423979 has 2 divisors, whose sum is σ = 30423980. Its totient is φ = 30423978.

The previous prime is 30423949. The next prime is 30424003. The reversal of 30423979 is 97932403.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30423979 - 2⁷ = 30423851 is a prime.

It is equal to p_1882585 and since 30423979 and 1882585 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (30423949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15211989 + 15211990.

It is an arithmetic number, because the mean of its divisors is an integer number (15211990).

Almost surely, 2^30423979 is an apocalyptic number.

30423979 is a deficient number, since it is larger than the sum of its proper divisors (1).

30423979 is an equidigital number, since it uses as much as digits as its factorization.

30423979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 30423979 is about 5515.7935965734. The cubic root of 30423979 is about 312.1801878028.

It can be divided in two parts, 3042 and 3979, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 30423979 in words is "thirty million, four hundred twenty-three thousand, nine hundred seventy-nine".