18403680 has 96 divisors (see below), whose sum is σ = 60528384. Its totient is φ = 4691456.

The previous prime is 18403663. The next prime is 18403709. The reversal of 18403680 is 8630481.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 10207 + ... + 11873.

It is an arithmetic number, because the mean of its divisors is an integer number (630504).

Almost surely, 2^18403680 is an apocalyptic number.

18403680 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 18403680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30264192).

18403680 is an abundant number, since it is smaller than the sum of its proper divisors (42124704).

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

18403680 is a wasteful number, since it uses less digits than its factorization.

18403680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1708 (or 1700 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18403680 is about 4289.9510486718. The cubic root of 18403680 is about 264.0188232676.

The spelling of 18403680 in words is "eighteen million, four hundred three thousand, six hundred eighty".