42040039 has 4 divisors (see below), whose sum is σ = 42053256. Its totient is φ = 42026824.

The previous prime is 42040007. The next prime is 42040051. The reversal of 42040039 is 93004024.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 42040039 - 2⁵ = 42040007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42040069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1392 + ... + 9274.

It is an arithmetic number, because the mean of its divisors is an integer number (10513314).

Almost surely, 2^42040039 is an apocalyptic number.

42040039 is a deficient number, since it is larger than the sum of its proper divisors (13217).

42040039 is an equidigital number, since it uses as much as digits as its factorization.

42040039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13216.

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

The square root of 42040039 is about 6483.8290384618. The cubic root of 42040039 is about 347.7130870506.

The spelling of 42040039 in words is "forty-two million, forty thousand, thirty-nine".