1187143 has 4 divisors (see below), whose sum is σ = 1193488. Its totient is φ = 1180800.

The previous prime is 1187141. The next prime is 1187159. The reversal of 1187143 is 3417811.

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

It is a cyclic number.

It is not a de Polignac number, because 1187143 - 2¹ = 1187141 is a prime.

It is a Duffinian number.

1187143 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2883 + ... + 3268.

It is an arithmetic number, because the mean of its divisors is an integer number (298372).

2^1187143 is an apocalyptic number.

1187143 is a deficient number, since it is larger than the sum of its proper divisors (6345).

1187143 is an equidigital number, since it uses as much as digits as its factorization.

1187143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6344.

The product of its digits is 672, while the sum is 25.

The square root of 1187143 is about 1089.5609207383. The cubic root of 1187143 is about 105.8849766900.

The spelling of 1187143 in words is "one million, one hundred eighty-seven thousand, one hundred forty-three".