42490039 has 4 divisors (see below), whose sum is σ = 44337456. Its totient is φ = 40642624.

The previous prime is 42490037. The next prime is 42490043. The reversal of 42490039 is 93009424.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42490039 - 2¹ = 42490037 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 (42490031) 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, 923674 + ... + 923719.

It is an arithmetic number, because the mean of its divisors is an integer number (11084364).

Almost surely, 2^42490039 is an apocalyptic number.

42490039 is a deficient number, since it is larger than the sum of its proper divisors (1847417).

42490039 is a wasteful number, since it uses less digits than its factorization.

42490039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1847416.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 42490039 is about 6518.4383866076. The cubic root of 42490039 is about 348.9493362470.

The spelling of 42490039 in words is "forty-two million, four hundred ninety thousand, thirty-nine".