22438781 has 2 divisors, whose sum is σ = 22438782. Its totient is φ = 22438780.

The previous prime is 22438739. The next prime is 22438783. The reversal of 22438781 is 18783422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11323225 + 11115556 = 3365^2 + 3334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22438781 is a prime.

It is a super-2 number, since 2×22438781² = 1006997785531922, which contains 22 as substring.

Together with 22438783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22438783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11219390 + 11219391.

It is an arithmetic number, because the mean of its divisors is an integer number (11219391).

Almost surely, 2^22438781 is an apocalyptic number.

It is an amenable number.

22438781 is a deficient number, since it is larger than the sum of its proper divisors (1).

22438781 is an equidigital number, since it uses as much as digits as its factorization.

22438781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504, while the sum is 35.

The square root of 22438781 is about 4736.9590456325. The cubic root of 22438781 is about 282.0545348314.

The spelling of 22438781 in words is "twenty-two million, four hundred thirty-eight thousand, seven hundred eighty-one".