1988966143 has 4 divisors (see below), whose sum is σ = 1989427000. Its totient is φ = 1988505288.

The previous prime is 1988966099. The next prime is 1988966171. The reversal of 1988966143 is 3416698891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3416698891 = 4289 ⋅796619.

It is a cyclic number.

It is not a de Polignac number, because 1988966143 - 2⁹ = 1988965631 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 (1988966443) 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, 223893 + ... + 232606.

It is an arithmetic number, because the mean of its divisors is an integer number (497356750).

Almost surely, 2^1988966143 is an apocalyptic number.

1988966143 is a deficient number, since it is larger than the sum of its proper divisors (460857).

1988966143 is an equidigital number, since it uses as much as digits as its factorization.

1988966143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460856.

The product of its digits is 2239488, while the sum is 55.

The square root of 1988966143 is about 44597.8266622938. The cubic root of 1988966143 is about 1257.5998111617.

The spelling of 1988966143 in words is "one billion, nine hundred eighty-eight million, nine hundred sixty-six thousand, one hundred forty-three".