42424939 has 2 divisors, whose sum is σ = 42424940. Its totient is φ = 42424938.

The previous prime is 42424933. The next prime is 42424981. The reversal of 42424939 is 93942424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42424939 - 2³ = 42424931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42424898 and 42424907.

It is not a weakly prime, because it can be changed into another prime (42424931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21212469 + 21212470.

It is an arithmetic number, because the mean of its divisors is an integer number (21212470).

Almost surely, 2^42424939 is an apocalyptic number.

42424939 is a deficient number, since it is larger than the sum of its proper divisors (1).

42424939 is an equidigital number, since it uses as much as digits as its factorization.

42424939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 37.

The square root of 42424939 is about 6513.4429451712. The cubic root of 42424939 is about 348.7710339613.

The spelling of 42424939 in words is "forty-two million, four hundred twenty-four thousand, nine hundred thirty-nine".