99997443 has 32 divisors (see below), whose sum is σ = 182336000. Its totient is φ = 52744608.

The previous prime is 99997441. The next prime is 99997459. The reversal of 99997443 is 34479999.

It is not a de Polignac number, because 99997443 - 2¹ = 99997441 is a prime.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99997443.

It is not an unprimeable number, because it can be changed into a prime (99997441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17893 + ... + 22806.

It is an arithmetic number, because the mean of its divisors is an integer number (5698000).

Almost surely, 2^99997443 is an apocalyptic number.

99997443 is a deficient number, since it is larger than the sum of its proper divisors (82338557).

99997443 is a wasteful number, since it uses less digits than its factorization.

99997443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40728 (or 40722 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 54.

The square root of 99997443 is about 9999.8721491827. The cubic root of 99997443 is about 464.1549271467.

The spelling of 99997443 in words is "ninety-nine million, nine hundred ninety-seven thousand, four hundred forty-three".