22185440 has 48 divisors (see below), whose sum is σ = 52699248. Its totient is φ = 8825856.

The previous prime is 22185419. The next prime is 22185451. The reversal of 22185440 is 4458122.

It is a happy number.

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, 49859 + ... + 50301.

It is an arithmetic number, because the mean of its divisors is an integer number (1097901).

Almost surely, 2^22185440 is an apocalyptic number.

22185440 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 22185440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26349624).

22185440 is an abundant number, since it is smaller than the sum of its proper divisors (30513808).

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

22185440 is a wasteful number, since it uses less digits than its factorization.

22185440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771 (or 763 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 22185440 is about 4710.1422483827. The cubic root of 22185440 is about 280.9890194668.

The spelling of 22185440 in words is "twenty-two million, one hundred eighty-five thousand, four hundred forty".