7981867 has 2 divisors, whose sum is σ = 7981868. Its totient is φ = 7981866.

The previous prime is 7981859. The next prime is 7981871. The reversal of 7981867 is 7681897.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7981867 - 2³ = 7981859 is a prime.

It is not a weakly prime, because it can be changed into another prime (7981807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3990933 + 3990934.

It is an arithmetic number, because the mean of its divisors is an integer number (3990934).

Almost surely, 2^7981867 is an apocalyptic number.

7981867 is a deficient number, since it is larger than the sum of its proper divisors (1).

7981867 is an equidigital number, since it uses as much as digits as its factorization.

7981867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 46.

The square root of 7981867 is about 2825.2198144569. The cubic root of 7981867 is about 199.8487773540.

The spelling of 7981867 in words is "seven million, nine hundred eighty-one thousand, eight hundred sixty-seven".