99997867 has 2 divisors, whose sum is σ = 99997868. Its totient is φ = 99997866.

The previous prime is 99997841. The next prime is 99997871. The reversal of 99997867 is 76879999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99997867 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99997799 and 99997808.

It is not a weakly prime, because it can be changed into another prime (99997837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49998933 + 49998934.

It is an arithmetic number, because the mean of its divisors is an integer number (49998934).

Almost surely, 2^99997867 is an apocalyptic number.

99997867 is a deficient number, since it is larger than the sum of its proper divisors (1).

99997867 is an equidigital number, since it uses as much as digits as its factorization.

99997867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15431472, while the sum is 64.

The square root of 99997867 is about 9999.8933494313. The cubic root of 99997867 is about 464.1555831682.

The spelling of 99997867 in words is "ninety-nine million, nine hundred ninety-seven thousand, eight hundred sixty-seven".