22776389 has 2 divisors, whose sum is σ = 22776390. Its totient is φ = 22776388.

The previous prime is 22776353. The next prime is 22776427. The reversal of 22776389 is 98367722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19731364 + 3045025 = 4442^2 + 1745^2 .

It is a cyclic number.

It is not a de Polignac number, because 22776389 - 2¹² = 22772293 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22776319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11388194 + 11388195.

It is an arithmetic number, because the mean of its divisors is an integer number (11388195).

Almost surely, 2^22776389 is an apocalyptic number.

It is an amenable number.

22776389 is a deficient number, since it is larger than the sum of its proper divisors (1).

22776389 is an equidigital number, since it uses as much as digits as its factorization.

22776389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 44.

The square root of 22776389 is about 4772.4615242032. The cubic root of 22776389 is about 283.4620719074.

It can be divided in two parts, 2 and 2776389, that multiplied together give a triangular number (5552778 = T₃₃₃₂).

The spelling of 22776389 in words is "twenty-two million, seven hundred seventy-six thousand, three hundred eighty-nine".