1988143 has 4 divisors (see below), whose sum is σ = 2074608. Its totient is φ = 1901680.

The previous prime is 1988137. The next prime is 1988177. The reversal of 1988143 is 3418891.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1988143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1988099 and 1988108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43198 + ... + 43243.

It is an arithmetic number, because the mean of its divisors is an integer number (518652).

2^1988143 is an apocalyptic number.

1988143 is a deficient number, since it is larger than the sum of its proper divisors (86465).

1988143 is an equidigital number, since it uses as much as digits as its factorization.

1988143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86464.

The product of its digits is 6912, while the sum is 34.

The square root of 1988143 is about 1410.0152481445. The cubic root of 1988143 is about 125.7426299356.

The spelling of 1988143 in words is "one million, nine hundred eighty-eight thousand, one hundred forty-three".