18684040 has 16 divisors (see below), whose sum is σ = 42039180. Its totient is φ = 7473600.

The previous prime is 18684031. The next prime is 18684077. The reversal of 18684040 is 4048681.

It can be written as a sum of positive squares in 2 ways, for example, as 18679684 + 4356 = 4322^2 + 66^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18683993 and 18684011.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233511 + ... + 233590.

Almost surely, 2^18684040 is an apocalyptic number.

18684040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18684040 is an abundant number, since it is smaller than the sum of its proper divisors (23355140).

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

18684040 is a wasteful number, since it uses less digits than its factorization.

18684040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467112 (or 467108 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 18684040 is about 4322.5039039890. The cubic root of 18684040 is about 265.3527520166.

The spelling of 18684040 in words is "eighteen million, six hundred eighty-four thousand, forty".