1216143 has 12 divisors (see below), whose sum is σ = 1769560. Its totient is φ = 804816.

The previous prime is 1216123. The next prime is 1216147. The reversal of 1216143 is 3416121.

It is a happy number.

It is not a de Polignac number, because 1216143 - 2⁹ = 1215631 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

1216143 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216147) 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 11 ways as a sum of consecutive naturals, for example, 1053 + ... + 1881.

2^1216143 is an apocalyptic number.

1216143 is a deficient number, since it is larger than the sum of its proper divisors (553417).

1216143 is a wasteful number, since it uses less digits than its factorization.

1216143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998 (or 995 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1216143 is about 1102.7887377009. The cubic root of 1216143 is about 106.7402497918.

The spelling of 1216143 in words is "one million, two hundred sixteen thousand, one hundred forty-three".