18661008 has 40 divisors (see below), whose sum is σ = 49766656. Its totient is φ = 6019200.

The previous prime is 18660959. The next prime is 18661009. The reversal of 18661008 is 80016681.

It is not an unprimeable number, because it can be changed into a prime (18661009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4783 + ... + 7758.

Almost surely, 2^18661008 is an apocalyptic number.

It is an amenable number.

18661008 is an abundant number, since it is smaller than the sum of its proper divisors (31105648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18661008 is a wasteful number, since it uses less digits than its factorization.

18661008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12583 (or 12577 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 18661008 is about 4319.8388858845. The cubic root of 18661008 is about 265.2436728669.

Adding to 18661008 its reverse (80016681), we get a palindrome (98677689).

The spelling of 18661008 in words is "eighteen million, six hundred sixty-one thousand, eight".