18372730 has 8 divisors (see below), whose sum is σ = 33070932. Its totient is φ = 7349088.

The previous prime is 18372727. The next prime is 18372769. The reversal of 18372730 is 3727381.

It can be written as a sum of positive squares in 2 ways, for example, as 16638241 + 1734489 = 4079^2 + 1317^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 18372692 and 18372701.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 918627 + ... + 918646.

Almost surely, 2^18372730 is an apocalyptic number.

18372730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18372730 is a deficient number, since it is larger than the sum of its proper divisors (14698202).

18372730 is a wasteful number, since it uses less digits than its factorization.

18372730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837280.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 18372730 is about 4286.3422635156. The cubic root of 18372730 is about 263.8707375306.

The spelling of 18372730 in words is "eighteen million, three hundred seventy-two thousand, seven hundred thirty".