99443887 has 2 divisors, whose sum is σ = 99443888. Its totient is φ = 99443886.

The previous prime is 99443843. The next prime is 99443909. The reversal of 99443887 is 78834499.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99443887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99444887) 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, 49721943 + 49721944.

It is an arithmetic number, because the mean of its divisors is an integer number (49721944).

Almost surely, 2^99443887 is an apocalyptic number.

99443887 is a deficient number, since it is larger than the sum of its proper divisors (1).

99443887 is an equidigital number, since it uses as much as digits as its factorization.

99443887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 52.

The square root of 99443887 is about 9972.1555844261. The cubic root of 99443887 is about 463.2968674899.

It can be divided in two parts, 9944 and 3887, that added together give a palindrome (13831).

The spelling of 99443887 in words is "ninety-nine million, four hundred forty-three thousand, eight hundred eighty-seven".