99893987 has 2 divisors, whose sum is σ = 99893988. Its totient is φ = 99893986.

The previous prime is 99893971. The next prime is 99894019. The reversal of 99893987 is 78939899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99893987 - 2⁴ = 99893971 is a prime.

It is not a weakly prime, because it can be changed into another prime (99823987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49946993 + 49946994.

It is an arithmetic number, because the mean of its divisors is an integer number (49946994).

Almost surely, 2^99893987 is an apocalyptic number.

99893987 is a deficient number, since it is larger than the sum of its proper divisors (1).

99893987 is an equidigital number, since it uses as much as digits as its factorization.

99893987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8817984, while the sum is 62.

The square root of 99893987 is about 9994.6979444103. The cubic root of 99893987 is about 463.9948024462.

The spelling of 99893987 in words is "ninety-nine million, eight hundred ninety-three thousand, nine hundred eighty-seven".