99809945 has 8 divisors (see below), whose sum is σ = 126075840. Its totient is φ = 75645360.

The previous prime is 99809939. The next prime is 99809981. The reversal of 99809945 is 54990899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99809945 - 2⁶ = 99809881 is a prime.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 525221 + ... + 525410.

It is an arithmetic number, because the mean of its divisors is an integer number (15759480).

Almost surely, 2^99809945 is an apocalyptic number.

99809945 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

99809945 is a deficient number, since it is larger than the sum of its proper divisors (26265895).

99809945 is a wasteful number, since it uses less digits than its factorization.

99809945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050655.

The product of its (nonzero) digits is 1049760, while the sum is 53.

The square root of 99809945 is about 9990.4927305914. The cubic root of 99809945 is about 463.8646444887.

The spelling of 99809945 in words is "ninety-nine million, eight hundred nine thousand, nine hundred forty-five".