22287440 has 40 divisors (see below), whose sum is σ = 59222400. Its totient is φ = 7641216.

The previous prime is 22287413. The next prime is 22287443. The reversal of 22287440 is 4478222.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22287443) 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, 19340 + ... + 20459.

It is an arithmetic number, because the mean of its divisors is an integer number (1480560).

Almost surely, 2^22287440 is an apocalyptic number.

22287440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22287440 is an abundant number, since it is smaller than the sum of its proper divisors (36934960).

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

22287440 is a wasteful number, since it uses less digits than its factorization.

22287440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39819 (or 39813 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 22287440 is about 4720.9575299933. The cubic root of 22287440 is about 281.4189871691.

The spelling of 22287440 in words is "twenty-two million, two hundred eighty-seven thousand, four hundred forty".