22222440 has 48 divisors (see below), whose sum is σ = 72224100. Its totient is φ = 5925888.

The previous prime is 22222433. The next prime is 22222471. The reversal of 22222440 is 4422222.

22222440 is a `hidden beast` number, since 2 + 2 + 222 + 440 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20738916 + 1483524 = 4554^2 + 1218^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 30505 + ... + 31224.

Almost surely, 2^22222440 is an apocalyptic number.

22222440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22222440 is an abundant number, since it is smaller than the sum of its proper divisors (50001660).

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

22222440 is a wasteful number, since it uses less digits than its factorization.

22222440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61746 (or 61739 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 22222440 is about 4714.0683066752. The cubic root of 22222440 is about 281.1451401687.

Adding to 22222440 its reverse (4422222), we get a palindrome (26644662).

The spelling of 22222440 in words is "twenty-two million, two hundred twenty-two thousand, four hundred forty".