9978143 has 8 divisors (see below), whose sum is σ = 11430912. Its totient is φ = 8532216.

The previous prime is 9978131. The next prime is 9978169. The reversal of 9978143 is 3418799.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9978143 - 2⁶ = 9978079 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9978143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1946 + ... + 4872.

It is an arithmetic number, because the mean of its divisors is an integer number (1428864).

Almost surely, 2^9978143 is an apocalyptic number.

9978143 is a deficient number, since it is larger than the sum of its proper divisors (1452769).

9978143 is a wasteful number, since it uses less digits than its factorization.

9978143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3421.

The product of its digits is 54432, while the sum is 41.

The square root of 9978143 is about 3158.8198745734. The cubic root of 9978143 is about 215.2863895746.

The spelling of 9978143 in words is "nine million, nine hundred seventy-eight thousand, one hundred forty-three".