18228677 has 2 divisors, whose sum is σ = 18228678. Its totient is φ = 18228676.

The previous prime is 18228671. The next prime is 18228701. The reversal of 18228677 is 77682281.

18228677 = 2464² + 2465² + 2466².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13184161 + 5044516 = 3631^2 + 2246^2 .

It is an emirp because it is prime and its reverse (77682281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18228677 - 2⁸ = 18228421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18228671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9114338 + 9114339.

It is an arithmetic number, because the mean of its divisors is an integer number (9114339).

Almost surely, 2^18228677 is an apocalyptic number.

It is an amenable number.

18228677 is a deficient number, since it is larger than the sum of its proper divisors (1).

18228677 is an equidigital number, since it uses as much as digits as its factorization.

18228677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 41.

The square root of 18228677 is about 4269.5054748765. The cubic root of 18228677 is about 263.1792933778.

The spelling of 18228677 in words is "eighteen million, two hundred twenty-eight thousand, six hundred seventy-seven".