22040400 has 60 divisors (see below), whose sum is σ = 70606592. Its totient is φ = 5877120.

The previous prime is 22040393. The next prime is 22040429. The reversal of 22040400 is 404022.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7984 + ... + 10383.

Almost surely, 2^22040400 is an apocalyptic number.

22040400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22040400 is an abundant number, since it is smaller than the sum of its proper divisors (48566192).

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

22040400 is a wasteful number, since it uses less digits than its factorization.

22040400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18388 (or 18377 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 22040400 is about 4694.7204389612. The cubic root of 22040400 is about 280.3753469534.

Adding to 22040400 its reverse (404022), we get a palindrome (22444422).

It can be divided in two parts, 2 and 2040400, that added together give a palindrome (2040402).

The spelling of 22040400 in words is "twenty-two million, forty thousand, four hundred".