22388140 has 24 divisors (see below), whose sum is σ = 47814480. Its totient is φ = 8803008.

The previous prime is 22388111. The next prime is 22388147. The reversal of 22388140 is 4188322.

It is a junction number, because it is equal to n+sod(n) for n = 22388099 and 22388108.

It is not an unprimeable number, because it can be changed into a prime (22388147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8307 + ... + 10666.

It is an arithmetic number, because the mean of its divisors is an integer number (1992270).

Almost surely, 2^22388140 is an apocalyptic number.

22388140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22388140 is an abundant number, since it is smaller than the sum of its proper divisors (25426340).

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

22388140 is a wasteful number, since it uses less digits than its factorization.

22388140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19041 (or 19039 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 22388140 is about 4731.6107194062. The cubic root of 22388140 is about 281.8421899264.

The spelling of 22388140 in words is "twenty-two million, three hundred eighty-eight thousand, one hundred forty".