42913979 has 2 divisors, whose sum is σ = 42913980. Its totient is φ = 42913978.

The previous prime is 42913963. The next prime is 42913987. The reversal of 42913979 is 97931924.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42913979 - 2⁴ = 42913963 is a prime.

It is a super-2 number, since 2×42913979² = 3683219187224882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42913279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21456989 + 21456990.

It is an arithmetic number, because the mean of its divisors is an integer number (21456990).

Almost surely, 2^42913979 is an apocalyptic number.

42913979 is a deficient number, since it is larger than the sum of its proper divisors (1).

42913979 is an equidigital number, since it uses as much as digits as its factorization.

42913979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 44.

The square root of 42913979 is about 6550.8762009368. The cubic root of 42913979 is about 350.1060331799.

The spelling of 42913979 in words is "forty-two million, nine hundred thirteen thousand, nine hundred seventy-nine".