99940443 has 4 divisors (see below), whose sum is σ = 133253928. Its totient is φ = 66626960.

The previous prime is 99940429. The next prime is 99940499. The reversal of 99940443 is 34404999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34404999 = 3 ⋅11468333.

It is a cyclic number.

It is not a de Polignac number, because 99940443 - 2²⁰ = 98891867 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99940395 and 99940404.

It is not an unprimeable number, because it can be changed into a prime (99940843) 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 in 3 ways as a sum of consecutive naturals, for example, 16656738 + ... + 16656743.

It is an arithmetic number, because the mean of its divisors is an integer number (33313482).

Almost surely, 2^99940443 is an apocalyptic number.

99940443 is a deficient number, since it is larger than the sum of its proper divisors (33313485).

99940443 is a wasteful number, since it uses less digits than its factorization.

99940443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33313484.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 99940443 is about 9997.0217064884. The cubic root of 99940443 is about 464.0667186933.

The spelling of 99940443 in words is "ninety-nine million, nine hundred forty thousand, four hundred forty-three".