18680340 has 96 divisors (see below), whose sum is σ = 60641280. Its totient is φ = 4208256.

The previous prime is 18680323. The next prime is 18680351. The reversal of 18680340 is 4308681.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 18680298 and 18680307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32899 + ... + 33461.

It is an arithmetic number, because the mean of its divisors is an integer number (631680).

Almost surely, 2^18680340 is an apocalyptic number.

18680340 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 18680340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30320640).

18680340 is an abundant number, since it is smaller than the sum of its proper divisors (41960940).

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

18680340 is a wasteful number, since it uses less digits than its factorization.

18680340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661 (or 659 counting only the distinct ones).

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

The square root of 18680340 is about 4322.0758901250. The cubic root of 18680340 is about 265.3352349271.

The spelling of 18680340 in words is "eighteen million, six hundred eighty thousand, three hundred forty".