22781226 has 32 divisors (see below), whose sum is σ = 49589568. Its totient is φ = 6935040.

The previous prime is 22781221. The next prime is 22781261. The reversal of 22781226 is 62218722.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22781193 and 22781202.

It is not an unprimeable number, because it can be changed into a prime (22781221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6061 + ... + 9071.

It is an arithmetic number, because the mean of its divisors is an integer number (1549674).

Almost surely, 2^22781226 is an apocalyptic number.

22781226 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 22781226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24794784).

22781226 is an abundant number, since it is smaller than the sum of its proper divisors (26808342).

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

22781226 is a wasteful number, since it uses less digits than its factorization.

22781226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3126.

The product of its digits is 5376, while the sum is 30.

The square root of 22781226 is about 4772.9682588511. The cubic root of 22781226 is about 283.4821366770.

Adding to 22781226 its reverse (62218722), we get a palindrome (84999948).

The spelling of 22781226 in words is "twenty-two million, seven hundred eighty-one thousand, two hundred twenty-six".