42445979 has 2 divisors, whose sum is σ = 42445980. Its totient is φ = 42445978.

The previous prime is 42445961. The next prime is 42445987. The reversal of 42445979 is 97954424.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42445979 - 2²⁴ = 25668763 is a prime.

It is a super-2 number, since 2×42445979² = 3603322266536882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42445999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21222989 + 21222990.

It is an arithmetic number, because the mean of its divisors is an integer number (21222990).

Almost surely, 2^42445979 is an apocalyptic number.

42445979 is a deficient number, since it is larger than the sum of its proper divisors (1).

42445979 is an equidigital number, since it uses as much as digits as its factorization.

42445979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 44.

The square root of 42445979 is about 6515.0578662050. The cubic root of 42445979 is about 348.8286803204.

The spelling of 42445979 in words is "forty-two million, four hundred forty-five thousand, nine hundred seventy-nine".