42430139 has 2 divisors, whose sum is σ = 42430140. Its totient is φ = 42430138.

The previous prime is 42430117. The next prime is 42430253. The reversal of 42430139 is 93103424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42430139 - 2⁸ = 42429883 is a prime.

It is not a weakly prime, because it can be changed into another prime (42430109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21215069 + 21215070.

It is an arithmetic number, because the mean of its divisors is an integer number (21215070).

Almost surely, 2^42430139 is an apocalyptic number.

42430139 is a deficient number, since it is larger than the sum of its proper divisors (1).

42430139 is an equidigital number, since it uses as much as digits as its factorization.

42430139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 42430139 is about 6513.8421073895. The cubic root of 42430139 is about 348.7852829331.

The spelling of 42430139 in words is "forty-two million, four hundred thirty thousand, one hundred thirty-nine".