100905639 has 8 divisors (see below), whose sum is σ = 135366912. Its totient is φ = 66857400.

The previous prime is 100905613. The next prime is 100905641. The reversal of 100905639 is 936509001.

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

It is not a de Polignac number, because 100905639 - 2⁸ = 100905383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100905689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102687 + ... + 103664.

It is an arithmetic number, because the mean of its divisors is an integer number (16920864).

Almost surely, 2^100905639 is an apocalyptic number.

100905639 is a deficient number, since it is larger than the sum of its proper divisors (34461273).

100905639 is a wasteful number, since it uses less digits than its factorization.

100905639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206517.

The product of its (nonzero) digits is 7290, while the sum is 33.

The square root of 100905639 is about 10045.1798888820. The cubic root of 100905639 is about 465.5558758640. Note that the first 3 decimals are identical.

The spelling of 100905639 in words is "one hundred million, nine hundred five thousand, six hundred thirty-nine".