7857943 has 2 divisors, whose sum is σ = 7857944. Its totient is φ = 7857942.

The previous prime is 7857917. The next prime is 7857947. The reversal of 7857943 is 3497587.

It is a happy number.

7857943 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7857943 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 7857943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7857947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3928971 + 3928972.

It is an arithmetic number, because the mean of its divisors is an integer number (3928972).

Almost surely, 2^7857943 is an apocalyptic number.

7857943 is a deficient number, since it is larger than the sum of its proper divisors (1).

7857943 is an equidigital number, since it uses as much as digits as its factorization.

7857943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 43.

The square root of 7857943 is about 2803.2022759694. The cubic root of 7857943 is about 198.8091147021.

The spelling of 7857943 in words is "seven million, eight hundred fifty-seven thousand, nine hundred forty-three".