22391989 has 4 divisors (see below), whose sum is σ = 22661856. Its totient is φ = 22122124.

The previous prime is 22391983. The next prime is 22392011. The reversal of 22391989 is 98919322.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22391989 - 2³ = 22391981 is a prime.

It is a super-2 number, since 2×22391989² = 1002802342752242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22391981) 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, 134809 + ... + 134974.

It is an arithmetic number, because the mean of its divisors is an integer number (5665464).

Almost surely, 2^22391989 is an apocalyptic number.

It is an amenable number.

22391989 is a deficient number, since it is larger than the sum of its proper divisors (269867).

22391989 is an equidigital number, since it uses as much as digits as its factorization.

22391989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269866.

The product of its digits is 69984, while the sum is 43.

The square root of 22391989 is about 4732.0174344565. The cubic root of 22391989 is about 281.8583405673.

The spelling of 22391989 in words is "twenty-two million, three hundred ninety-one thousand, nine hundred eighty-nine".