18881193 has 8 divisors (see below), whose sum is σ = 26500000. Its totient is φ = 11924928.

The previous prime is 18881173. The next prime is 18881209. The reversal of 18881193 is 39118881.

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

It is not a de Polignac number, because 18881193 - 2⁶ = 18881129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18881123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165568 + ... + 165681.

It is an arithmetic number, because the mean of its divisors is an integer number (3312500).

Almost surely, 2^18881193 is an apocalyptic number.

It is an amenable number.

18881193 is a deficient number, since it is larger than the sum of its proper divisors (7618807).

18881193 is a wasteful number, since it uses less digits than its factorization.

18881193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331271.

The product of its digits is 13824, while the sum is 39.

The square root of 18881193 is about 4345.2494750014. The cubic root of 18881193 is about 266.2828177053.

It can be divided in two parts, 1888 and 1193, that added together give a triangular number (3081 = T₇₈).

The spelling of 18881193 in words is "eighteen million, eight hundred eighty-one thousand, one hundred ninety-three".