18133730 has 16 divisors (see below), whose sum is σ = 34561080. Its totient is φ = 6826752.

The previous prime is 18133727. The next prime is 18133777. The reversal of 18133730 is 3733181.

It can be written as a sum of positive squares in 4 ways, for example, as 12967201 + 5166529 = 3601^2 + 2273^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18133730.

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 7 ways as a sum of consecutive naturals, for example, 53165 + ... + 53504.

Almost surely, 2^18133730 is an apocalyptic number.

18133730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18133730 is a deficient number, since it is larger than the sum of its proper divisors (16427350).

18133730 is a wasteful number, since it uses less digits than its factorization.

18133730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106693.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 18133730 is about 4258.3717545560. The cubic root of 18133730 is about 262.7215604849.

The spelling of 18133730 in words is "eighteen million, one hundred thirty-three thousand, seven hundred thirty".