18947842 has 8 divisors (see below), whose sum is σ = 28446732. Its totient is φ = 9465600.

The previous prime is 18947827. The next prime is 18947849. The reversal of 18947842 is 24874981.

It can be written as a sum of positive squares in 2 ways, for example, as 18931201 + 16641 = 4351^2 + 129^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18947849) 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, 759 + ... + 6202.

Almost surely, 2^18947842 is an apocalyptic number.

18947842 is a deficient number, since it is larger than the sum of its proper divisors (9498890).

18947842 is a wasteful number, since it uses less digits than its factorization.

18947842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8324.

The product of its digits is 129024, while the sum is 43.

The square root of 18947842 is about 4352.9118989476. The cubic root of 18947842 is about 266.5957683048.

The spelling of 18947842 in words is "eighteen million, nine hundred forty-seven thousand, eight hundred forty-two".