22978217 has 2 divisors, whose sum is σ = 22978218. Its totient is φ = 22978216.

The previous prime is 22978187. The next prime is 22978231. The reversal of 22978217 is 71287922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21939856 + 1038361 = 4684^2 + 1019^2 .

It is a cyclic number.

It is not a de Polignac number, because 22978217 - 2¹⁴ = 22961833 is a prime.

It is not a weakly prime, because it can be changed into another prime (22978247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11489108 + 11489109.

It is an arithmetic number, because the mean of its divisors is an integer number (11489109).

Almost surely, 2^22978217 is an apocalyptic number.

It is an amenable number.

22978217 is a deficient number, since it is larger than the sum of its proper divisors (1).

22978217 is an equidigital number, since it uses as much as digits as its factorization.

22978217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 38.

The square root of 22978217 is about 4793.5599506004. The cubic root of 22978217 is about 284.2968899831.

The spelling of 22978217 in words is "twenty-two million, nine hundred seventy-eight thousand, two hundred seventeen".