18366869 has 2 divisors, whose sum is σ = 18366870. Its totient is φ = 18366868.

The previous prime is 18366847. The next prime is 18366899. The reversal of 18366869 is 96866381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10804369 + 7562500 = 3287^2 + 2750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18366869 is a prime.

It is a super-2 number, since 2×18366869² = 674683753726322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18366809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9183434 + 9183435.

It is an arithmetic number, because the mean of its divisors is an integer number (9183435).

Almost surely, 2^18366869 is an apocalyptic number.

It is an amenable number.

18366869 is a deficient number, since it is larger than the sum of its proper divisors (1).

18366869 is an equidigital number, since it uses as much as digits as its factorization.

18366869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 47.

The square root of 18366869 is about 4285.6585258277. The cubic root of 18366869 is about 263.8426758168.

The spelling of 18366869 in words is "eighteen million, three hundred sixty-six thousand, eight hundred sixty-nine".