11990143 has 4 divisors (see below), whose sum is σ = 13080168. Its totient is φ = 10900120.

The previous prime is 11990141. The next prime is 11990171. The reversal of 11990143 is 34109911.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 11990143 - 2¹ = 11990141 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 (11990141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 544996 + ... + 545017.

It is an arithmetic number, because the mean of its divisors is an integer number (3270042).

Almost surely, 2^11990143 is an apocalyptic number.

11990143 is a deficient number, since it is larger than the sum of its proper divisors (1090025).

11990143 is a wasteful number, since it uses less digits than its factorization.

11990143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090024.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 11990143 is about 3462.6785874522. The cubic root of 11990143 is about 228.8801455153.

The spelling of 11990143 in words is "eleven million, nine hundred ninety thousand, one hundred forty-three".