18190193 has 4 divisors (see below), whose sum is σ = 20788800. Its totient is φ = 15591588.

The previous prime is 18190127. The next prime is 18190223. The reversal of 18190193 is 39109181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39109181 = 89 ⋅439429.

It is a cyclic number.

It is not a de Polignac number, because 18190193 - 2¹⁴ = 18173809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18190103) 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, 1299293 + ... + 1299306.

It is an arithmetic number, because the mean of its divisors is an integer number (5197200).

Almost surely, 2^18190193 is an apocalyptic number.

It is an amenable number.

18190193 is a deficient number, since it is larger than the sum of its proper divisors (2598607).

18190193 is an equidigital number, since it uses as much as digits as its factorization.

18190193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2598606.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 18190193 is about 4264.9962485329. The cubic root of 18190193 is about 262.9939566915.

Adding to 18190193 its sum of digits (32), we get a square (18190225 = 4265²).

The spelling of 18190193 in words is "eighteen million, one hundred ninety thousand, one hundred ninety-three".