17981842 has 8 divisors (see below), whose sum is σ = 27101232. Its totient is φ = 8948100.

The previous prime is 17981833. The next prime is 17981849. The reversal of 17981842 is 24818971.

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 = 17981795 and 17981804.

It is not an unprimeable number, because it can be changed into a prime (17981849) 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, 20884 + ... + 21727.

It is an arithmetic number, because the mean of its divisors is an integer number (3387654).

Almost surely, 2^17981842 is an apocalyptic number.

17981842 is a deficient number, since it is larger than the sum of its proper divisors (9119390).

17981842 is a wasteful number, since it uses less digits than its factorization.

17981842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42824.

The product of its digits is 32256, while the sum is 40.

The square root of 17981842 is about 4240.5002063436. The cubic root of 17981842 is about 261.9859849155.

The spelling of 17981842 in words is "seventeen million, nine hundred eighty-one thousand, eight hundred forty-two".