22390991 has 6 divisors (see below), whose sum is σ = 26046720. Its totient is φ = 19192236.

The previous prime is 22390981. The next prime is 22390997. The reversal of 22390991 is 19909322.

It is a de Polignac number, because none of the positive numbers 2^k-22390991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22390997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 228431 + ... + 228528.

It is an arithmetic number, because the mean of its divisors is an integer number (4341120).

Almost surely, 2^22390991 is an apocalyptic number.

22390991 is a deficient number, since it is larger than the sum of its proper divisors (3655729).

22390991 is an equidigital number, since it uses as much as digits as its factorization.

22390991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456973 (or 456966 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 22390991 is about 4731.9119814299. The cubic root of 22390991 is about 281.8541530756.

The spelling of 22390991 in words is "twenty-two million, three hundred ninety thousand, nine hundred ninety-one".