11993143 has 16 divisors (see below), whose sum is σ = 13625280. Its totient is φ = 10492416.

The previous prime is 11993129. The next prime is 11993147. The reversal of 11993143 is 34139911.

It is a de Polignac number, because none of the positive numbers 2^k-11993143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11993147) 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 15 ways as a sum of consecutive naturals, for example, 14053 + ... + 14881.

It is an arithmetic number, because the mean of its divisors is an integer number (851580).

Almost surely, 2^11993143 is an apocalyptic number.

11993143 is a deficient number, since it is larger than the sum of its proper divisors (1632137).

11993143 is a wasteful number, since it uses less digits than its factorization.

11993143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906.

The product of its digits is 2916, while the sum is 31.

The square root of 11993143 is about 3463.1117510124. Note that the first 3 decimals coincide. The cubic root of 11993143 is about 228.8992329489.

The spelling of 11993143 in words is "eleven million, nine hundred ninety-three thousand, one hundred forty-three".