18121143 has 16 divisors (see below), whose sum is σ = 25804800. Its totient is φ = 11286240.

The previous prime is 18121123. The next prime is 18121151. The reversal of 18121143 is 34112181.

It is a happy number.

It is not a de Polignac number, because 18121143 - 2¹⁰ = 18120119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18121123) 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, 663 + ... + 6056.

It is an arithmetic number, because the mean of its divisors is an integer number (1612800).

Almost surely, 2^18121143 is an apocalyptic number.

18121143 is a deficient number, since it is larger than the sum of its proper divisors (7683657).

18121143 is a wasteful number, since it uses less digits than its factorization.

18121143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6782.

The product of its digits is 192, while the sum is 21.

The square root of 18121143 is about 4256.8935857031. The cubic root of 18121143 is about 262.6607595778.

The spelling of 18121143 in words is "eighteen million, one hundred twenty-one thousand, one hundred forty-three".