100839845 has 4 divisors (see below), whose sum is σ = 121007820. Its totient is φ = 80671872.

The previous prime is 100839841. The next prime is 100839857. The reversal of 100839845 is 548938001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12348196 + 88491649 = 3514^2 + 9407^2 .

It is a cyclic number.

It is not a de Polignac number, because 100839845 - 2² = 100839841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100839799 and 100839808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100839841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10083980 + ... + 10083989.

It is an arithmetic number, because the mean of its divisors is an integer number (30251955).

Almost surely, 2^100839845 is an apocalyptic number.

It is an amenable number.

100839845 is a deficient number, since it is larger than the sum of its proper divisors (20167975).

100839845 is an equidigital number, since it uses as much as digits as its factorization.

100839845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20167974.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 100839845 is about 10041.9044508499. The cubic root of 100839845 is about 465.4546676346.

The spelling of 100839845 in words is "one hundred million, eight hundred thirty-nine thousand, eight hundred forty-five".