99840443 has 2 divisors, whose sum is σ = 99840444. Its totient is φ = 99840442.

The previous prime is 99840409. The next prime is 99840457. The reversal of 99840443 is 34404899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99840443 - 2²⁰ = 98791867 is a prime.

It is a super-2 number, since 2×99840443² = 19936228116872498, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 99840443.

It is not a weakly prime, because it can be changed into another prime (99840463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49920221 + 49920222.

It is an arithmetic number, because the mean of its divisors is an integer number (49920222).

Almost surely, 2^99840443 is an apocalyptic number.

99840443 is a deficient number, since it is larger than the sum of its proper divisors (1).

99840443 is an equidigital number, since it uses as much as digits as its factorization.

99840443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 99840443 is about 9992.0189651541. The cubic root of 99840443 is about 463.9118859509.

The spelling of 99840443 in words is "ninety-nine million, eight hundred forty thousand, four hundred forty-three".