22402540 has 24 divisors (see below), whose sum is σ = 47153232. Its totient is φ = 8940480.

The previous prime is 22402537. The next prime is 22402543. The reversal of 22402540 is 4520422.

It is an interprime number because it is at equal distance from previous prime (22402537) and next prime (22402543).

It is not an unprimeable number, because it can be changed into a prime (22402543) 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, 10135 + ... + 12145.

It is an arithmetic number, because the mean of its divisors is an integer number (1964718).

Almost surely, 2^22402540 is an apocalyptic number.

22402540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22402540 is an abundant number, since it is smaller than the sum of its proper divisors (24750692).

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

22402540 is a wasteful number, since it uses less digits than its factorization.

22402540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577 (or 2575 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 22402540 is about 4733.1321553491. The cubic root of 22402540 is about 281.9026037244.

Adding to 22402540 its reverse (4520422), we get a palindrome (26922962).

The spelling of 22402540 in words is "twenty-two million, four hundred two thousand, five hundred forty".