2390581 has 4 divisors (see below), whose sum is σ = 2397600. Its totient is φ = 2383564.

The previous prime is 2390579. The next prime is 2390611. The reversal of 2390581 is 1850932.

2390581 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2390581 - 2¹ = 2390579 is a prime.

It is a super-2 number, since 2×2390581² = 11429755035122, which contains 22 as substring.

It is a Duffinian number.

2390581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2393581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2971 + ... + 3688.

It is an arithmetic number, because the mean of its divisors is an integer number (599400).

2^2390581 is an apocalyptic number.

It is an amenable number.

2390581 is a deficient number, since it is larger than the sum of its proper divisors (7019).

2390581 is an equidigital number, since it uses as much as digits as its factorization.

2390581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7018.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 2390581 is about 1546.1503807845. The cubic root of 2390581 is about 133.7112106924.

The spelling of 2390581 in words is "two million, three hundred ninety thousand, five hundred eighty-one".