100439809 has 8 divisors (see below), whose sum is σ = 101098368. Its totient is φ = 99784080.

The previous prime is 100439803. The next prime is 100439819. The reversal of 100439809 is 908934001.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100439809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100439803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170814 + ... + 171400.

It is an arithmetic number, because the mean of its divisors is an integer number (12637296).

Almost surely, 2^100439809 is an apocalyptic number.

It is an amenable number.

100439809 is a deficient number, since it is larger than the sum of its proper divisors (658559).

100439809 is an equidigital number, since it uses as much as digits as its factorization.

100439809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1415.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 100439809 is about 10021.9663240304. The cubic root of 100439809 is about 464.8383590487.

The spelling of 100439809 in words is "one hundred million, four hundred thirty-nine thousand, eight hundred nine".