18662988 has 12 divisors (see below), whose sum is σ = 43547000. Its totient is φ = 6220992.

The previous prime is 18662983. The next prime is 18662993. The reversal of 18662988 is 88926681.

It is an interprime number because it is at equal distance from previous prime (18662983) and next prime (18662993).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18662981) 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 in 3 ways as a sum of consecutive naturals, for example, 777613 + ... + 777636.

Almost surely, 2^18662988 is an apocalyptic number.

It is an amenable number.

18662988 is an abundant number, since it is smaller than the sum of its proper divisors (24884012).

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

18662988 is a wasteful number, since it uses less digits than its factorization.

18662988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555256 (or 1555254 counting only the distinct ones).

The product of its digits is 331776, while the sum is 48.

The square root of 18662988 is about 4320.0680550195. The cubic root of 18662988 is about 265.2530536374.

The spelling of 18662988 in words is "eighteen million, six hundred sixty-two thousand, nine hundred eighty-eight".