99784543 has 4 divisors (see below), whose sum is σ = 105654240. Its totient is φ = 93914848.

The previous prime is 99784513. The next prime is 99784549. The reversal of 99784543 is 34548799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34548799 = 1373 ⋅25163.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99784543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99784549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2934823 + ... + 2934856.

It is an arithmetic number, because the mean of its divisors is an integer number (26413560).

Almost surely, 2^99784543 is an apocalyptic number.

99784543 is a deficient number, since it is larger than the sum of its proper divisors (5869697).

99784543 is a wasteful number, since it uses less digits than its factorization.

99784543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5869696.

The product of its digits is 1088640, while the sum is 49.

The square root of 99784543 is about 9989.2213410255. The cubic root of 99784543 is about 463.8252893942.

The spelling of 99784543 in words is "ninety-nine million, seven hundred eighty-four thousand, five hundred forty-three".