18478488 has 96 divisors (see below), whose sum is σ = 56635200. Its totient is φ = 4995648.

The previous prime is 18478487. The next prime is 18478489. The reversal of 18478488 is 88487481.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18478487) and next prime (18478489).

It is a super-2 number, since 2×18478488² = 682909037532288, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18478483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21931 + ... + 22757.

It is an arithmetic number, because the mean of its divisors is an integer number (589950).

Almost surely, 2^18478488 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 18478488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28317600).

18478488 is an abundant number, since it is smaller than the sum of its proper divisors (38156712).

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

18478488 is a wasteful number, since it uses less digits than its factorization.

18478488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869 (or 858 counting only the distinct ones).

The product of its digits is 458752, while the sum is 48.

The square root of 18478488 is about 4298.6611869279. The cubic root of 18478488 is about 264.3760710071.

The spelling of 18478488 in words is "eighteen million, four hundred seventy-eight thousand, four hundred eighty-eight".