18240730 has 8 divisors (see below), whose sum is σ = 32833332. Its totient is φ = 7296288.

The previous prime is 18240713. The next prime is 18240743. The reversal of 18240730 is 3704281.

It can be written as a sum of positive squares in 2 ways, for example, as 16232841 + 2007889 = 4029^2 + 1417^2 .

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 = 18240695 and 18240704.

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, 912027 + ... + 912046.

Almost surely, 2^18240730 is an apocalyptic number.

18240730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18240730 is a deficient number, since it is larger than the sum of its proper divisors (14592602).

18240730 is a wasteful number, since it uses less digits than its factorization.

18240730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1824080.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 18240730 is about 4270.9167634127. The cubic root of 18240730 is about 263.2372862707.

The spelling of 18240730 in words is "eighteen million, two hundred forty thousand, seven hundred thirty".