22140040 has 32 divisors (see below), whose sum is σ = 53648280. Its totient is φ = 8174592.

The previous prime is 22140029. The next prime is 22140047. The reversal of 22140040 is 4004122.

It can be written as a sum of positive squares in 4 ways, for example, as 18507204 + 3632836 = 4302^2 + 1906^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 22140040.

It is not an unprimeable number, because it can be changed into a prime (22140047) 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, 20769 + ... + 21808.

Almost surely, 2^22140040 is an apocalyptic number.

22140040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22140040 is an abundant number, since it is smaller than the sum of its proper divisors (31508240).

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

22140040 is a wasteful number, since it uses less digits than its factorization.

22140040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42601 (or 42597 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 22140040 is about 4705.3203929169. The cubic root of 22140040 is about 280.7972177980.

Adding to 22140040 its reverse (4004122), we get a palindrome (26144162).

The spelling of 22140040 in words is "twenty-two million, one hundred forty thousand, forty".