22125440 has 64 divisors (see below), whose sum is σ = 53464320. Its totient is φ = 8755200.

The previous prime is 22125437. The next prime is 22125469. The reversal of 22125440 is 4452122.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115745 + ... + 115935.

It is an arithmetic number, because the mean of its divisors is an integer number (835380).

Almost surely, 2^22125440 is an apocalyptic number.

22125440 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 22125440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26732160).

22125440 is an abundant number, since it is smaller than the sum of its proper divisors (31338880).

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

22125440 is a wasteful number, since it uses less digits than its factorization.

22125440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 22125440 is about 4703.7687017965. The cubic root of 22125440 is about 280.7354813714.

Adding to 22125440 its reverse (4452122), we get a palindrome (26577562).

The spelling of 22125440 in words is "twenty-two million, one hundred twenty-five thousand, four hundred forty".