22949640 has 144 divisors (see below), whose sum is σ = 86830380. Its totient is φ = 5241600.

The previous prime is 22949639. The next prime is 22949651. The reversal of 22949640 is 4694922.

22949640 is a `hidden beast` number, since 2 + 2 + 9 + 4 + 9 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18714276 + 4235364 = 4326^2 + 2058^2 .

It is a super-2 number, since 2×22949640² = 1053371952259200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 22949595 and 22949604.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16990 + ... + 18290.

Almost surely, 2^22949640 is an apocalyptic number.

22949640 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 22949640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43415190).

22949640 is an abundant number, since it is smaller than the sum of its proper divisors (63880740).

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

22949640 is a wasteful number, since it uses less digits than its factorization.

22949640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332 (or 1318 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 22949640 is about 4790.5782531966. The cubic root of 22949640 is about 284.1789852370.

The spelling of 22949640 in words is "twenty-two million, nine hundred forty-nine thousand, six hundred forty".