105806139 has 8 divisors (see below), whose sum is σ = 141791760. Its totient is φ = 70178976.

The previous prime is 105806093. The next prime is 105806143. The reversal of 105806139 is 931608501.

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

It is not a de Polignac number, because 105806139 - 2⁹ = 105805627 is a prime.

It is a super-2 number, since 2×105806139² = 22389878100174642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (105806189) 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, 88924 + ... + 90105.

It is an arithmetic number, because the mean of its divisors is an integer number (17723970).

Almost surely, 2^105806139 is an apocalyptic number.

105806139 is a deficient number, since it is larger than the sum of its proper divisors (35985621).

105806139 is a wasteful number, since it uses less digits than its factorization.

105806139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179229.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 105806139 is about 10286.2111100249. The cubic root of 105806139 is about 472.9736601208.

The spelling of 105806139 in words is "one hundred five million, eight hundred six thousand, one hundred thirty-nine".