42439307 has 2 divisors, whose sum is σ = 42439308. Its totient is φ = 42439306.

The previous prime is 42439249. The next prime is 42439381. The reversal of 42439307 is 70393424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42439307 - 2⁸ = 42439051 is a prime.

It is not a weakly prime, because it can be changed into another prime (42430307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21219653 + 21219654.

It is an arithmetic number, because the mean of its divisors is an integer number (21219654).

Almost surely, 2^42439307 is an apocalyptic number.

42439307 is a deficient number, since it is larger than the sum of its proper divisors (1).

42439307 is an equidigital number, since it uses as much as digits as its factorization.

42439307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 42439307 is about 6514.5458015122. The cubic root of 42439307 is about 348.8104021312.

The spelling of 42439307 in words is "forty-two million, four hundred thirty-nine thousand, three hundred seven".