2290391 has 4 divisors (see below), whose sum is σ = 2369400. Its totient is φ = 2211384.

The previous prime is 2290369. The next prime is 2290403. The reversal of 2290391 is 1930922.

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 2290391 - 2¹⁴ = 2274007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2290391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2290091) by changing a digit.

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, 39461 + ... + 39518.

It is an arithmetic number, because the mean of its divisors is an integer number (592350).

2^2290391 is an apocalyptic number.

2290391 is a deficient number, since it is larger than the sum of its proper divisors (79009).

2290391 is an equidigital number, since it uses as much as digits as its factorization.

2290391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79008.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 2290391 is about 1513.4037795645. The cubic root of 2290391 is about 131.8165303868.

The spelling of 2290391 in words is "two million, two hundred ninety thousand, three hundred ninety-one".