22431444 has 48 divisors (see below), whose sum is σ = 60455808. Its totient is φ = 6340608.

The previous prime is 22431439. The next prime is 22431473. The reversal of 22431444 is 44413422.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6772 + ... + 9524.

It is an arithmetic number, because the mean of its divisors is an integer number (1259496).

Almost surely, 2^22431444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22431444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30227904).

22431444 is an abundant number, since it is smaller than the sum of its proper divisors (38024364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22431444 is a wasteful number, since it uses less digits than its factorization.

22431444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2864 (or 2862 counting only the distinct ones).

The product of its digits is 3072, while the sum is 24.

The square root of 22431444 is about 4736.1845403236. The cubic root of 22431444 is about 282.0237895528.

Adding to 22431444 its reverse (44413422), we get a palindrome (66844866).

The spelling of 22431444 in words is "twenty-two million, four hundred thirty-one thousand, four hundred forty-four".