18488656 has 40 divisors (see below), whose sum is σ = 38361384. Its totient is φ = 8601600.

The previous prime is 18488633. The next prime is 18488669. The reversal of 18488656 is 65688481.

It can be written as a sum of positive squares in 4 ways, for example, as 8503056 + 9985600 = 2916^2 + 3160^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27136 + ... + 27808.

Almost surely, 2^18488656 is an apocalyptic number.

18488656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18488656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19180692).

18488656 is an abundant number, since it is smaller than the sum of its proper divisors (19872728).

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

18488656 is a wasteful number, since it uses less digits than its factorization.

18488656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799 (or 793 counting only the distinct ones).

The product of its digits is 368640, while the sum is 46.

The square root of 18488656 is about 4299.8437180902. The cubic root of 18488656 is about 264.4245541040.

The spelling of 18488656 in words is "eighteen million, four hundred eighty-eight thousand, six hundred fifty-six".