18663242 has 8 divisors (see below), whose sum is σ = 30148356. Its totient is φ = 8613792.

The previous prime is 18663233. The next prime is 18663257. The reversal of 18663242 is 24236681.

It can be written as a sum of positive squares in 2 ways, for example, as 17147881 + 1515361 = 4141^2 + 1231^2 .

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 = 18663199 and 18663208.

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, 358883 + ... + 358934.

Almost surely, 2^18663242 is an apocalyptic number.

18663242 is a deficient number, since it is larger than the sum of its proper divisors (11485114).

18663242 is a wasteful number, since it uses less digits than its factorization.

18663242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717832.

The product of its digits is 13824, while the sum is 32.

The square root of 18663242 is about 4320.0974526045. The cubic root of 18663242 is about 265.2542569812.

The spelling of 18663242 in words is "eighteen million, six hundred sixty-three thousand, two hundred forty-two".