22388991 has 4 divisors (see below), whose sum is σ = 29851992. Its totient is φ = 14925992.

The previous prime is 22388987. The next prime is 22389019. The reversal of 22388991 is 19988322.

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 22388991 - 2² = 22388987 is a prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22388981) 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, 3731496 + ... + 3731501.

It is an arithmetic number, because the mean of its divisors is an integer number (7462998).

Almost surely, 2^22388991 is an apocalyptic number.

22388991 is a deficient number, since it is larger than the sum of its proper divisors (7463001).

22388991 is an equidigital number, since it uses as much as digits as its factorization.

22388991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7463000.

The product of its digits is 62208, while the sum is 42.

The square root of 22388991 is about 4731.7006456453. The cubic root of 22388991 is about 281.8457609342.

The spelling of 22388991 in words is "twenty-two million, three hundred eighty-eight thousand, nine hundred ninety-one".