18889193 has 8 divisors (see below), whose sum is σ = 20179368. Its totient is φ = 17618944.

The previous prime is 18889183. The next prime is 18889201. The reversal of 18889193 is 39198881.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 937024 + 17952169 = 968^2 + 4237^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18889193 - 2¹⁰ = 18888169 is a prime.

It is a super-2 number, since 2×18889193² = 713603224382498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18889133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2996 + ... + 6837.

It is an arithmetic number, because the mean of its divisors is an integer number (2522421).

Almost surely, 2^18889193 is an apocalyptic number.

It is an amenable number.

18889193 is a deficient number, since it is larger than the sum of its proper divisors (1290175).

18889193 is a wasteful number, since it uses less digits than its factorization.

18889193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9963.

The product of its digits is 124416, while the sum is 47.

The square root of 18889193 is about 4346.1699230472. The cubic root of 18889193 is about 266.3204205861.

The spelling of 18889193 in words is "eighteen million, eight hundred eighty-nine thousand, one hundred ninety-three".