18618730 has 48 divisors (see below), whose sum is σ = 37946880. Its totient is φ = 6561984.

The previous prime is 18618709. The next prime is 18618731. The reversal of 18618730 is 3781681.

It is not an unprimeable number, because it can be changed into a prime (18618731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38631 + ... + 39109.

It is an arithmetic number, because the mean of its divisors is an integer number (790560).

Almost surely, 2^18618730 is an apocalyptic number.

18618730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18618730 is an abundant number, since it is smaller than the sum of its proper divisors (19328150).

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

18618730 is a wasteful number, since it uses less digits than its factorization.

18618730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535 (or 522 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 18618730 is about 4314.9426415655. The cubic root of 18618730 is about 265.0432111807.

The spelling of 18618730 in words is "eighteen million, six hundred eighteen thousand, seven hundred thirty".