7899863 has 2 divisors, whose sum is σ = 7899864. Its totient is φ = 7899862.

The previous prime is 7899851. The next prime is 7899869. The reversal of 7899863 is 3689987.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7899863 - 2⁸ = 7899607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7899869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3949931 + 3949932.

It is an arithmetic number, because the mean of its divisors is an integer number (3949932).

Almost surely, 2^7899863 is an apocalyptic number.

7899863 is a deficient number, since it is larger than the sum of its proper divisors (1).

7899863 is an equidigital number, since it uses as much as digits as its factorization.

7899863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 50.

The square root of 7899863 is about 2810.6694931991. The cubic root of 7899863 is about 199.1620188416.

The spelling of 7899863 in words is "seven million, eight hundred ninety-nine thousand, eight hundred sixty-three".