40042039 has 2 divisors, whose sum is σ = 40042040. Its totient is φ = 40042038.

The previous prime is 40042027. The next prime is 40042043. The reversal of 40042039 is 93024004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40042039 - 2⁵ = 40042007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40042099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20021019 + 20021020.

It is an arithmetic number, because the mean of its divisors is an integer number (20021020).

Almost surely, 2^40042039 is an apocalyptic number.

40042039 is a deficient number, since it is larger than the sum of its proper divisors (1).

40042039 is an equidigital number, since it uses as much as digits as its factorization.

40042039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 40042039 is about 6327.8779223370. The cubic root of 40042039 is about 342.1149568523.

The spelling of 40042039 in words is "forty million, forty-two thousand, thirty-nine".