22278239 has 2 divisors, whose sum is σ = 22278240. Its totient is φ = 22278238.

The previous prime is 22278233. The next prime is 22278247. The reversal of 22278239 is 93287222.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22278239 - 2¹⁶ = 22212703 is a prime.

It is a super-2 number, since 2×22278239² = 992639865882242, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 22278199 and 22278208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22278233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11139119 + 11139120.

It is an arithmetic number, because the mean of its divisors is an integer number (11139120).

Almost surely, 2^22278239 is an apocalyptic number.

22278239 is a deficient number, since it is larger than the sum of its proper divisors (1).

22278239 is an equidigital number, since it uses as much as digits as its factorization.

22278239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 35.

The square root of 22278239 is about 4719.9829448844. The cubic root of 22278239 is about 281.3802554514.

The spelling of 22278239 in words is "twenty-two million, two hundred seventy-eight thousand, two hundred thirty-nine".