22389440 has 112 divisors (see below), whose sum is σ = 57448704. Its totient is φ = 8294400.

The previous prime is 22389427. The next prime is 22389473. The reversal of 22389440 is 4498322.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 22389397 and 22389406.

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, 367010 + ... + 367070.

Almost surely, 2^22389440 is an apocalyptic number.

22389440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22389440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28724352).

22389440 is an abundant number, since it is smaller than the sum of its proper divisors (35059264).

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

22389440 is a wasteful number, since it uses less digits than its factorization.

22389440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 22389440 is about 4731.7480913506. The cubic root of 22389440 is about 281.8476450135.

The spelling of 22389440 in words is "twenty-two million, three hundred eighty-nine thousand, four hundred forty".