19947118 has 8 divisors (see below), whose sum is σ = 31221648. Its totient is φ = 9539904.

The previous prime is 19947113. The next prime is 19947119. The reversal of 19947118 is 81174991.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19947113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216771 + ... + 216862.

It is an arithmetic number, because the mean of its divisors is an integer number (3902706).

Almost surely, 2^19947118 is an apocalyptic number.

19947118 is a deficient number, since it is larger than the sum of its proper divisors (11274530).

19947118 is a wasteful number, since it uses less digits than its factorization.

19947118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433658.

The product of its digits is 18144, while the sum is 40.

The square root of 19947118 is about 4466.2196542490. The cubic root of 19947118 is about 271.2023107706.

The spelling of 19947118 in words is "nineteen million, nine hundred forty-seven thousand, one hundred eighteen".