18666340 has 192 divisors, whose sum is σ = 55738368. Its totient is φ = 5068800.

The previous prime is 18666337. The next prime is 18666353. The reversal of 18666340 is 4366681.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 18666296 and 18666305.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 602125 + ... + 602155.

It is an arithmetic number, because the mean of its divisors is an integer number (290304).

Almost surely, 2^18666340 is an apocalyptic number.

18666340 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 18666340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27869184).

18666340 is an abundant number, since it is smaller than the sum of its proper divisors (37072028).

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

18666340 is a wasteful number, since it uses less digits than its factorization.

18666340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 18666340 is about 4320.4559944524. The cubic root of 18666340 is about 265.2689331063.

The spelling of 18666340 in words is "eighteen million, six hundred sixty-six thousand, three hundred forty".