22784639 has 2 divisors, whose sum is σ = 22784640. Its totient is φ = 22784638.

The previous prime is 22784609. The next prime is 22784683. The reversal of 22784639 is 93648722.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22784639 - 2⁸ = 22784383 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22784596 and 22784605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22784609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11392319 + 11392320.

It is an arithmetic number, because the mean of its divisors is an integer number (11392320).

Almost surely, 2^22784639 is an apocalyptic number.

22784639 is a deficient number, since it is larger than the sum of its proper divisors (1).

22784639 is an equidigital number, since it uses as much as digits as its factorization.

22784639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 41.

The square root of 22784639 is about 4773.3257797892. The cubic root of 22784639 is about 283.4962927226.

The spelling of 22784639 in words is "twenty-two million, seven hundred eighty-four thousand, six hundred thirty-nine".