16191893 has 4 divisors (see below), whose sum is σ = 16310220. Its totient is φ = 16073568.

The previous prime is 16191887. The next prime is 16191913. The reversal of 16191893 is 39819161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39819161 = 43 ⋅926027.

It can be written as a sum of positive squares in 2 ways, for example, as 13118884 + 3073009 = 3622^2 + 1753^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16191893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16191853) 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, 58958 + ... + 59231.

It is an arithmetic number, because the mean of its divisors is an integer number (4077555).

Almost surely, 2^16191893 is an apocalyptic number.

It is an amenable number.

16191893 is a deficient number, since it is larger than the sum of its proper divisors (118327).

16191893 is a wasteful number, since it uses less digits than its factorization.

16191893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118326.

The product of its digits is 11664, while the sum is 38.

The square root of 16191893 is about 4023.9151332999. The cubic root of 16191893 is about 252.9875844699.

The spelling of 16191893 in words is "sixteen million, one hundred ninety-one thousand, eight hundred ninety-three".