22890391 has 4 divisors (see below), whose sum is σ = 23204032. Its totient is φ = 22576752.

The previous prime is 22890377. The next prime is 22890401. The reversal of 22890391 is 19309822.

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 22890391 - 2¹¹ = 22888343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22890331) 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, 156711 + ... + 156856.

It is an arithmetic number, because the mean of its divisors is an integer number (5801008).

Almost surely, 2^22890391 is an apocalyptic number.

22890391 is a deficient number, since it is larger than the sum of its proper divisors (313641).

22890391 is an equidigital number, since it uses as much as digits as its factorization.

22890391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313640.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 22890391 is about 4784.3903477873. The cubic root of 22890391 is about 283.9342198706.

The spelling of 22890391 in words is "twenty-two million, eight hundred ninety thousand, three hundred ninety-one".