18243907 has 8 divisors (see below), whose sum is σ = 21073392. Its totient is φ = 15609600.

The previous prime is 18243881. The next prime is 18243913. The reversal of 18243907 is 70934281.

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

It is a cyclic number.

It is not a de Polignac number, because 18243907 - 2¹⁹ = 17719619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18243917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48594 + ... + 48967.

It is an arithmetic number, because the mean of its divisors is an integer number (2634174).

Almost surely, 2^18243907 is an apocalyptic number.

18243907 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18243907 is a deficient number, since it is larger than the sum of its proper divisors (2829485).

18243907 is a wasteful number, since it uses less digits than its factorization.

18243907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97589.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 18243907 is about 4271.2886814169. The cubic root of 18243907 is about 263.2525681209.

The spelling of 18243907 in words is "eighteen million, two hundred forty-three thousand, nine hundred seven".