18240443 has 8 divisors (see below), whose sum is σ = 19681200. Its totient is φ = 16805088.

The previous prime is 18240419. The next prime is 18240463. The reversal of 18240443 is 34404281.

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 18240443 - 2¹² = 18236347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18240413) 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, 8228 + ... + 10206.

It is an arithmetic number, because the mean of its divisors is an integer number (2460150).

Almost surely, 2^18240443 is an apocalyptic number.

18240443 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18240443 is a deficient number, since it is larger than the sum of its proper divisors (1440757).

18240443 is a wasteful number, since it uses less digits than its factorization.

18240443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2701.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 18240443 is about 4270.8831639369. The cubic root of 18240443 is about 263.2359056699.

The spelling of 18240443 in words is "eighteen million, two hundred forty thousand, four hundred forty-three".