22525440 has 160 divisors (see below), whose sum is σ = 82494720. Its totient is φ = 5136384.

The previous prime is 22525439. The next prime is 22525457. The reversal of 22525440 is 4452522.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 22525440.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53551 + ... + 53969.

It is an arithmetic number, because the mean of its divisors is an integer number (515592).

Almost surely, 2^22525440 is an apocalyptic number.

22525440 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 22525440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41247360).

22525440 is an abundant number, since it is smaller than the sum of its proper divisors (59969280).

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

22525440 is an equidigital number, since it uses as much as digits as its factorization.

22525440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452 (or 436 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 22525440 is about 4746.0973441344. The cubic root of 22525440 is about 282.4171683956.

Adding to 22525440 its reverse (4452522), we get a palindrome (26977962).

The spelling of 22525440 in words is "twenty-two million, five hundred twenty-five thousand, four hundred forty".