22398891 has 8 divisors (see below), whose sum is σ = 31437120. Its totient is φ = 14146632.

The previous prime is 22398881. The next prime is 22398899. The reversal of 22398891 is 19889322.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22398891 - 2⁷ = 22398763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22398899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196425 + ... + 196538.

It is an arithmetic number, because the mean of its divisors is an integer number (3929640).

Almost surely, 2^22398891 is an apocalyptic number.

22398891 is a deficient number, since it is larger than the sum of its proper divisors (9038229).

22398891 is a wasteful number, since it uses less digits than its factorization.

22398891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392985.

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

The square root of 22398891 is about 4732.7466655210. The cubic root of 22398891 is about 281.8872971497.

The spelling of 22398891 in words is "twenty-two million, three hundred ninety-eight thousand, eight hundred ninety-one".