22398889 has 4 divisors (see below), whose sum is σ = 22414420. Its totient is φ = 22383360.

The previous prime is 22398881. The next prime is 22398899. The reversal of 22398889 is 98889322.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18662400 + 3736489 = 4320^2 + 1933^2 .

It is a cyclic number.

It is not a de Polignac number, because 22398889 - 2³ = 22398881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22398881) 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, 5352 + ... + 8569.

It is an arithmetic number, because the mean of its divisors is an integer number (5603605).

Almost surely, 2^22398889 is an apocalyptic number.

It is an amenable number.

22398889 is a deficient number, since it is larger than the sum of its proper divisors (15531).

22398889 is a wasteful number, since it uses less digits than its factorization.

22398889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15530.

The product of its digits is 497664, while the sum is 49.

The square root of 22398889 is about 4732.7464542272. The cubic root of 22398889 is about 281.8872887598.

The spelling of 22398889 in words is "twenty-two million, three hundred ninety-eight thousand, eight hundred eighty-nine".