22991040 has 140 divisors (see below), whose sum is σ = 81875376. Its totient is φ = 6124032.

The previous prime is 22991011. The next prime is 22991041. The reversal of 22991040 is 4019922.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 22990995 and 22991013.

It is not an unprimeable number, because it can be changed into a prime (22991041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25477 + ... + 26363.

Almost surely, 2^22991040 is an apocalyptic number.

22991040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22991040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40937688).

22991040 is an abundant number, since it is smaller than the sum of its proper divisors (58884336).

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

22991040 is an equidigital number, since it uses as much as digits as its factorization.

22991040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916 (or 897 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 22991040 is about 4794.8972877425. The cubic root of 22991040 is about 284.3497641334.

The spelling of 22991040 in words is "twenty-two million, nine hundred ninety-one thousand, forty".