7143989 has 2 divisors, whose sum is σ = 7143990. Its totient is φ = 7143988.

The previous prime is 7143979. The next prime is 7144001. The reversal of 7143989 is 9893417.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6543364 + 600625 = 2558^2 + 775^2 .

It is an emirp because it is prime and its reverse (9893417) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7143989 - 2²⁰ = 6095413 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7143959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3571994 + 3571995.

It is an arithmetic number, because the mean of its divisors is an integer number (3571995).

Almost surely, 2^7143989 is an apocalyptic number.

It is an amenable number.

7143989 is a deficient number, since it is larger than the sum of its proper divisors (1).

7143989 is an equidigital number, since it uses as much as digits as its factorization.

7143989 is an evil number, because the sum of its binary digits is even.

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

The square root of 7143989 is about 2672.8241618184. The cubic root of 7143989 is about 192.5958503937.

The spelling of 7143989 in words is "seven million, one hundred forty-three thousand, nine hundred eighty-nine".