18487040 has 144 divisors (see below), whose sum is σ = 52538976. Its totient is φ = 6144000.

The previous prime is 18487039. The next prime is 18487061. The reversal of 18487040 is 4078481.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 18486988 and 18487006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182990 + ... + 183090.

It is an arithmetic number, because the mean of its divisors is an integer number (364854).

Almost surely, 2^18487040 is an apocalyptic number.

18487040 is a gapful number since it is divisible by the number (10) 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 18487040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26269488).

18487040 is an abundant number, since it is smaller than the sum of its proper divisors (34051936).

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

18487040 is a wasteful number, since it uses less digits than its factorization.

18487040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 18487040 is about 4299.6558001775. The cubic root of 18487040 is about 264.4168498748.

It can be divided in two parts, 1848 and 7040, that added together give a palindrome (8888).

The spelling of 18487040 in words is "eighteen million, four hundred eighty-seven thousand, forty".