18066840 has 64 divisors (see below), whose sum is σ = 59132160. Its totient is φ = 4379520.

The previous prime is 18066833. The next prime is 18066857. The reversal of 18066840 is 4866081.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 5524 + ... + 8163.

It is an arithmetic number, because the mean of its divisors is an integer number (923940).

Almost surely, 2^18066840 is an apocalyptic number.

18066840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18066840 is an abundant number, since it is smaller than the sum of its proper divisors (41065320).

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

18066840 is a wasteful number, since it uses less digits than its factorization.

18066840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13712 (or 13708 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 18066840 is about 4250.5105575683. The cubic root of 18066840 is about 262.3981282709.

It can be divided in two parts, 1806 and 6840, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 18066840 in words is "eighteen million, sixty-six thousand, eight hundred forty".