42090739 has 2 divisors, whose sum is σ = 42090740. Its totient is φ = 42090738.

The previous prime is 42090733. The next prime is 42090749. The reversal of 42090739 is 93709024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42090739 - 2³ = 42090731 is a prime.

It is a super-2 number, since 2×42090739² = 3543260619132242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42090731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21045369 + 21045370.

It is an arithmetic number, because the mean of its divisors is an integer number (21045370).

Almost surely, 2^42090739 is an apocalyptic number.

42090739 is a deficient number, since it is larger than the sum of its proper divisors (1).

42090739 is an equidigital number, since it uses as much as digits as its factorization.

42090739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 42090739 is about 6487.7375871717. The cubic root of 42090739 is about 347.8528107667.

The spelling of 42090739 in words is "forty-two million, ninety thousand, seven hundred thirty-nine".