99993947 has 2 divisors, whose sum is σ = 99993948. Its totient is φ = 99993946.

The previous prime is 99993923. The next prime is 99993991. The reversal of 99993947 is 74939999.

It is a weak prime.

It is an emirp because it is prime and its reverse (74939999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99993947 - 2²² = 95799643 is a prime.

It is not a weakly prime, because it can be changed into another prime (99993917) 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, 49996973 + 49996974.

It is an arithmetic number, because the mean of its divisors is an integer number (49996974).

Almost surely, 2^99993947 is an apocalyptic number.

99993947 is a deficient number, since it is larger than the sum of its proper divisors (1).

99993947 is an equidigital number, since it uses as much as digits as its factorization.

99993947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4960116, while the sum is 59.

The square root of 99993947 is about 9999.6973454200. The cubic root of 99993947 is about 464.1495179932.

The spelling of 99993947 in words is "ninety-nine million, nine hundred ninety-three thousand, nine hundred forty-seven".