18647242 has 8 divisors (see below), whose sum is σ = 27994176. Its totient is φ = 9315852.

The previous prime is 18647231. The next prime is 18647243. The reversal of 18647242 is 24274681.

It is a happy number.

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 = 18647198 and 18647207.

It is not an unprimeable number, because it can be changed into a prime (18647243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178 + ... + 6109.

It is an arithmetic number, because the mean of its divisors is an integer number (3499272).

Almost surely, 2^18647242 is an apocalyptic number.

18647242 is a deficient number, since it is larger than the sum of its proper divisors (9346934).

18647242 is a wasteful number, since it uses less digits than its factorization.

18647242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7772.

The product of its digits is 21504, while the sum is 34.

The square root of 18647242 is about 4318.2452454672. The cubic root of 18647242 is about 265.1784344722.

The spelling of 18647242 in words is "eighteen million, six hundred forty-seven thousand, two hundred forty-two".