22188897 has 20 divisors (see below), whose sum is σ = 33715440. Its totient is φ = 14538744.

The previous prime is 22188871. The next prime is 22188923. The reversal of 22188897 is 79888122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22188871) and next prime (22188923).

It is not a de Polignac number, because 22188897 - 2⁶ = 22188833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22188097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2458 + ... + 7100.

It is an arithmetic number, because the mean of its divisors is an integer number (1685772).

Almost surely, 2^22188897 is an apocalyptic number.

22188897 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

22188897 is a deficient number, since it is larger than the sum of its proper divisors (11526543).

22188897 is an equidigital number, since it uses as much as digits as its factorization.

22188897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4714 (or 4705 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 22188897 is about 4710.5092081430. The cubic root of 22188897 is about 281.0036135518.

The spelling of 22188897 in words is "twenty-two million, one hundred eighty-eight thousand, eight hundred ninety-seven".