22665389 has 2 divisors, whose sum is σ = 22665390. Its totient is φ = 22665388.

The previous prime is 22665367. The next prime is 22665431. The reversal of 22665389 is 98356622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17222500 + 5442889 = 4150^2 + 2333^2 .

It is a cyclic number.

It is not a de Polignac number, because 22665389 - 2¹² = 22661293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22665089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11332694 + 11332695.

It is an arithmetic number, because the mean of its divisors is an integer number (11332695).

Almost surely, 2^22665389 is an apocalyptic number.

It is an amenable number.

22665389 is a deficient number, since it is larger than the sum of its proper divisors (1).

22665389 is an equidigital number, since it uses as much as digits as its factorization.

22665389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 41.

The square root of 22665389 is about 4760.8181019652. The cubic root of 22665389 is about 283.0008407289. Note that the first 3 decimals are identical.

The spelling of 22665389 in words is "twenty-two million, six hundred sixty-five thousand, three hundred eighty-nine".