42539407 has 2 divisors, whose sum is σ = 42539408. Its totient is φ = 42539406.

The previous prime is 42539369. The next prime is 42539417. The reversal of 42539407 is 70493524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42539407 - 2⁷ = 42539279 is a prime.

It is a super-2 number, since 2×42539407² = 3619202295823298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42539417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21269703 + 21269704.

It is an arithmetic number, because the mean of its divisors is an integer number (21269704).

Almost surely, 2^42539407 is an apocalyptic number.

42539407 is a deficient number, since it is larger than the sum of its proper divisors (1).

42539407 is an equidigital number, since it uses as much as digits as its factorization.

42539407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 42539407 is about 6522.2240838536. The cubic root of 42539407 is about 349.0844287982.

The spelling of 42539407 in words is "forty-two million, five hundred thirty-nine thousand, four hundred seven".