22187740 has 12 divisors (see below), whose sum is σ = 46594296. Its totient is φ = 8875088.

The previous prime is 22187729. The next prime is 22187741. The reversal of 22187740 is 4778122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22187741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 554674 + ... + 554713.

It is an arithmetic number, because the mean of its divisors is an integer number (3882858).

Almost surely, 2^22187740 is an apocalyptic number.

22187740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22187740 is an abundant number, since it is smaller than the sum of its proper divisors (24406556).

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

22187740 is a wasteful number, since it uses less digits than its factorization.

22187740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109396 (or 1109394 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 22187740 is about 4710.3863960401. The cubic root of 22187740 is about 280.9987293248.

The spelling of 22187740 in words is "twenty-two million, one hundred eighty-seven thousand, seven hundred forty".