22390631 has 4 divisors (see below), whose sum is σ = 22706064. Its totient is φ = 22075200.

The previous prime is 22390619. The next prime is 22390657. The reversal of 22390631 is 13609322.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13609322 = 2 ⋅6804661.

It is a cyclic number.

It is not a de Polignac number, because 22390631 - 2⁶ = 22390567 is a prime.

It is a super-2 number, since 2×22390631² = 1002680713156322, which contains 22 as substring.

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 22390631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22390681) 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, 157610 + ... + 157751.

It is an arithmetic number, because the mean of its divisors is an integer number (5676516).

Almost surely, 2^22390631 is an apocalyptic number.

22390631 is a deficient number, since it is larger than the sum of its proper divisors (315433).

22390631 is an equidigital number, since it uses as much as digits as its factorization.

22390631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315432.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 22390631 is about 4731.8739416853. The cubic root of 22390631 is about 281.8526425271.

Adding to 22390631 its reverse (13609322), we get a palindrome (35999953).

The spelling of 22390631 in words is "twenty-two million, three hundred ninety thousand, six hundred thirty-one".