22878439 has 2 divisors, whose sum is σ = 22878440. Its totient is φ = 22878438.

The previous prime is 22878431. The next prime is 22878467. The reversal of 22878439 is 93487822.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22878439 - 2³ = 22878431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22878395 and 22878404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22878431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11439219 + 11439220.

It is an arithmetic number, because the mean of its divisors is an integer number (11439220).

Almost surely, 2^22878439 is an apocalyptic number.

22878439 is a deficient number, since it is larger than the sum of its proper divisors (1).

22878439 is an equidigital number, since it uses as much as digits as its factorization.

22878439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 43.

The square root of 22878439 is about 4783.1411227351. The cubic root of 22878439 is about 283.8847934161.

The spelling of 22878439 in words is "twenty-two million, eight hundred seventy-eight thousand, four hundred thirty-nine".