18497680 has 40 divisors (see below), whose sum is σ = 43747200. Its totient is φ = 7271808.

The previous prime is 18497663. The next prime is 18497693. The reversal of 18497680 is 8679481.

It is a tau number, because it is divible by the number of its divisors (40).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2761 + ... + 6679.

It is an arithmetic number, because the mean of its divisors is an integer number (1093680).

Almost surely, 2^18497680 is an apocalyptic number.

18497680 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 18497680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21873600).

18497680 is an abundant number, since it is smaller than the sum of its proper divisors (25249520).

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

18497680 is a wasteful number, since it uses less digits than its factorization.

18497680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3991 (or 3985 counting only the distinct ones).

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

The square root of 18497680 is about 4300.8929305436. The cubic root of 18497680 is about 264.4675674895.

The spelling of 18497680 in words is "eighteen million, four hundred ninety-seven thousand, six hundred eighty".