22187440 has 80 divisors (see below), whose sum is σ = 59281920. Its totient is φ = 7637760.

The previous prime is 22187371. The next prime is 22187461. The reversal of 22187440 is 4478122.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 22187399 and 22187408.

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, 16057 + ... + 17383.

It is an arithmetic number, because the mean of its divisors is an integer number (741024).

Almost surely, 2^22187440 is an apocalyptic number.

22187440 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 22187440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29640960).

22187440 is an abundant number, since it is smaller than the sum of its proper divisors (37094480).

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

22187440 is a wasteful number, since it uses less digits than its factorization.

22187440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1370 (or 1364 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 22187440 is about 4710.3545514112. The cubic root of 22187440 is about 280.9974628596.

The spelling of 22187440 in words is "twenty-two million, one hundred eighty-seven thousand, four hundred forty".