42490865 has 4 divisors (see below), whose sum is σ = 50989044. Its totient is φ = 33992688.

The previous prime is 42490849. The next prime is 42490907. The reversal of 42490865 is 56809424.

42490865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 31315216 + 11175649 = 5596^2 + 3343^2 .

It is a cyclic number.

It is not a de Polignac number, because 42490865 - 2⁴ = 42490849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4249082 + ... + 4249091.

It is an arithmetic number, because the mean of its divisors is an integer number (12747261).

Almost surely, 2^42490865 is an apocalyptic number.

It is an amenable number.

42490865 is a deficient number, since it is larger than the sum of its proper divisors (8498179).

42490865 is an equidigital number, since it uses as much as digits as its factorization.

42490865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8498178.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 42490865 is about 6518.5017450331. The cubic root of 42490865 is about 348.9515974067.

The spelling of 42490865 in words is "forty-two million, four hundred ninety thousand, eight hundred sixty-five".