22278489 has 4 divisors (see below), whose sum is σ = 29704656. Its totient is φ = 14852324.

The previous prime is 22278439. The next prime is 22278493. The reversal of 22278489 is 98487222.

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 22278489 - 2⁸ = 22278233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22278489.

It is not an unprimeable number, because it can be changed into a prime (22278439) 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, 3713079 + ... + 3713084.

It is an arithmetic number, because the mean of its divisors is an integer number (7426164).

Almost surely, 2^22278489 is an apocalyptic number.

It is an amenable number.

22278489 is a deficient number, since it is larger than the sum of its proper divisors (7426167).

22278489 is an equidigital number, since it uses as much as digits as its factorization.

22278489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7426166.

The product of its digits is 129024, while the sum is 42.

The square root of 22278489 is about 4720.0094279567. The cubic root of 22278489 is about 281.3813079703.

The spelling of 22278489 in words is "twenty-two million, two hundred seventy-eight thousand, four hundred eighty-nine".