18117488 has 40 divisors (see below), whose sum is σ = 37594320. Its totient is φ = 8432640.

The previous prime is 18117443. The next prime is 18117497. The reversal of 18117488 is 88471181.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 18056 + ... + 19032.

It is an arithmetic number, because the mean of its divisors is an integer number (939858).

Almost surely, 2^18117488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18117488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18797160).

18117488 is an abundant number, since it is smaller than the sum of its proper divisors (19476832).

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

18117488 is a wasteful number, since it uses less digits than its factorization.

18117488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065 (or 1059 counting only the distinct ones).

The product of its digits is 14336, while the sum is 38.

The square root of 18117488 is about 4256.4642603927. The cubic root of 18117488 is about 262.6430989989.

18117488 divided by its sum of digits (38) gives a triangular number (476776 = T₉₇₆).

The spelling of 18117488 in words is "eighteen million, one hundred seventeen thousand, four hundred eighty-eight".