18888669 has 6 divisors (see below), whose sum is σ = 27283646. Its totient is φ = 12592440.

The previous prime is 18888643. The next prime is 18888671. The reversal of 18888669 is 96688881.

It can be written as a sum of positive squares in only one way, i.e., 16892100 + 1996569 = 4110^2 + 1413^2 .

It is not a de Polignac number, because 18888669 - 2⁵ = 18888637 is a prime.

It is a super-2 number, since 2×18888669² = 713563633183122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18888619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1049362 + ... + 1049379.

Almost surely, 2^18888669 is an apocalyptic number.

It is an amenable number.

18888669 is a deficient number, since it is larger than the sum of its proper divisors (8394977).

18888669 is a wasteful number, since it uses less digits than its factorization.

18888669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2098747 (or 2098744 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 54.

The square root of 18888669 is about 4346.1096396663. The cubic root of 18888669 is about 266.3179579223.

The spelling of 18888669 in words is "eighteen million, eight hundred eighty-eight thousand, six hundred sixty-nine".