7871863 has 2 divisors, whose sum is σ = 7871864. Its totient is φ = 7871862.

The previous prime is 7871837. The next prime is 7871873. The reversal of 7871863 is 3681787.

It is a strong prime.

It is an emirp because it is prime and its reverse (3681787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7871863 - 2⁹ = 7871351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7871813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3935931 + 3935932.

It is an arithmetic number, because the mean of its divisors is an integer number (3935932).

Almost surely, 2^7871863 is an apocalyptic number.

7871863 is a deficient number, since it is larger than the sum of its proper divisors (1).

7871863 is an equidigital number, since it uses as much as digits as its factorization.

7871863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 40.

The square root of 7871863 is about 2805.6840520629. The cubic root of 7871863 is about 198.9264393149.

The spelling of 7871863 in words is "seven million, eight hundred seventy-one thousand, eight hundred sixty-three".