18840243 has 8 divisors (see below), whose sum is σ = 26212608. Its totient is φ = 12014024.

The previous prime is 18840223. The next prime is 18840247. The reversal of 18840243 is 34204881.

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 18840243 - 2⁶ = 18840179 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18840243.

It is not an unprimeable number, because it can be changed into a prime (18840247) 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, 136455 + ... + 136592.

It is an arithmetic number, because the mean of its divisors is an integer number (3276576).

Almost surely, 2^18840243 is an apocalyptic number.

18840243 is a deficient number, since it is larger than the sum of its proper divisors (7372365).

18840243 is a wasteful number, since it uses less digits than its factorization.

18840243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273073.

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 18840243 is about 4340.5348748743. The cubic root of 18840243 is about 266.0901714381.

The spelling of 18840243 in words is "eighteen million, eight hundred forty thousand, two hundred forty-three".