18987460 has 48 divisors (see below), whose sum is σ = 43444800. Its totient is φ = 6943104.

The previous prime is 18987457. The next prime is 18987481. The reversal of 18987460 is 6478981.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

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 15 ways as a sum of consecutive naturals, for example, 10159 + ... + 11881.

It is an arithmetic number, because the mean of its divisors is an integer number (905100).

Almost surely, 2^18987460 is an apocalyptic number.

18987460 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 18987460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21722400).

18987460 is an abundant number, since it is smaller than the sum of its proper divisors (24457340).

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

18987460 is a wasteful number, since it uses less digits than its factorization.

18987460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1780 (or 1778 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 18987460 is about 4357.4602694689. The cubic root of 18987460 is about 266.7814471161.

The spelling of 18987460 in words is "eighteen million, nine hundred eighty-seven thousand, four hundred sixty".