22278439 has 2 divisors, whose sum is σ = 22278440. Its totient is φ = 22278438.

The previous prime is 22278437. The next prime is 22278493. The reversal of 22278439 is 93487222.

Together with next prime (22278493) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22278439 - 2¹ = 22278437 is a prime.

Together with 22278437, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 22278398 and 22278407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22278433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11139219 + 11139220.

It is an arithmetic number, because the mean of its divisors is an integer number (11139220).

Almost surely, 2^22278439 is an apocalyptic number.

22278439 is a deficient number, since it is larger than the sum of its proper divisors (1).

22278439 is an equidigital number, since it uses as much as digits as its factorization.

22278439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 37.

The square root of 22278439 is about 4720.0041313541. The cubic root of 22278439 is about 281.3810974671.

The spelling of 22278439 in words is "twenty-two million, two hundred seventy-eight thousand, four hundred thirty-nine".