18991114 has 8 divisors (see below), whose sum is σ = 29469060. Its totient is φ = 9168096.

The previous prime is 18991081. The next prime is 18991117. The reversal of 18991114 is 41119981.

It can be written as a sum of positive squares in 2 ways, for example, as 18774889 + 216225 = 4333^2 + 465^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 18991114.

It is not an unprimeable number, because it can be changed into a prime (18991117) 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, 163659 + ... + 163774.

Almost surely, 2^18991114 is an apocalyptic number.

18991114 is a deficient number, since it is larger than the sum of its proper divisors (10477946).

18991114 is a wasteful number, since it uses less digits than its factorization.

18991114 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327464.

The product of its digits is 2592, while the sum is 34.

The square root of 18991114 is about 4357.8795302303. The cubic root of 18991114 is about 266.7985594082.

The spelling of 18991114 in words is "eighteen million, nine hundred ninety-one thousand, one hundred fourteen".