18493680 has 80 divisors (see below), whose sum is σ = 57746304. Its totient is φ = 4896000.

The previous prime is 18493649. The next prime is 18493687. The reversal of 18493680 is 8639481.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18493687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60087 + ... + 60393.

Almost surely, 2^18493680 is an apocalyptic number.

18493680 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 18493680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28873152).

18493680 is an abundant number, since it is smaller than the sum of its proper divisors (39252624).

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

18493680 is a wasteful number, since it uses less digits than its factorization.

18493680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574 (or 568 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 18493680 is about 4300.4278856877. The cubic root of 18493680 is about 264.4485029991.

The spelling of 18493680 in words is "eighteen million, four hundred ninety-three thousand, six hundred eighty".