18240669 has 6 divisors (see below), whose sum is σ = 26347646. Its totient is φ = 12160440.

The previous prime is 18240659. The next prime is 18240689. The reversal of 18240669 is 96604281.

It can be written as a sum of positive squares in only one way, i.e., 11799225 + 6441444 = 3435^2 + 2538^2 .

It is not a de Polignac number, because 18240669 - 2⁸ = 18240413 is a prime.

It is a super-2 number, since 2×18240669² = 665444011135122, 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 (18240619) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1013362 + ... + 1013379.

Almost surely, 2^18240669 is an apocalyptic number.

It is an amenable number.

18240669 is a deficient number, since it is larger than the sum of its proper divisors (8106977).

18240669 is a wasteful number, since it uses less digits than its factorization.

18240669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2026747 (or 2026744 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 18240669 is about 4270.9096220829. The cubic root of 18240669 is about 263.2369928341.

The spelling of 18240669 in words is "eighteen million, two hundred forty thousand, six hundred sixty-nine".