22456789 has 4 divisors (see below), whose sum is σ = 22880556. Its totient is φ = 22033024.

The previous prime is 22456787. The next prime is 22456831. The reversal of 22456789 is 98765422.

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 7518564 + 14938225 = 2742^2 + 3865^2 .

It is a cyclic number.

It is not a de Polignac number, because 22456789 - 2¹ = 22456787 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22456787) 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, 211804 + ... + 211909.

It is an arithmetic number, because the mean of its divisors is an integer number (5720139).

Almost surely, 2^22456789 is an apocalyptic number.

It is an amenable number.

22456789 is a deficient number, since it is larger than the sum of its proper divisors (423767).

22456789 is an equidigital number, since it uses as much as digits as its factorization.

22456789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423766.

The product of its digits is 241920, while the sum is 43.

The square root of 22456789 is about 4738.8594619381. The cubic root of 22456789 is about 282.1299679236.

The spelling of 22456789 in words is "twenty-two million, four hundred fifty-six thousand, seven hundred eighty-nine".