10139805 has 24 divisors (see below), whose sum is σ = 18928728. Its totient is φ = 4991616.

The previous prime is 10139791. The next prime is 10139809. The reversal of 10139805 is 50893101.

It can be written as a sum of positive squares in 4 ways, for example, as 236196 + 9903609 = 486^2 + 3147^2 .

It is not a de Polignac number, because 10139805 - 2¹⁵ = 10107037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10139809) 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 23 ways as a sum of consecutive naturals, for example, 8082 + ... + 9251.

It is an arithmetic number, because the mean of its divisors is an integer number (788697).

Almost surely, 2^10139805 is an apocalyptic number.

10139805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10139805 is a deficient number, since it is larger than the sum of its proper divisors (8788923).

10139805 is a wasteful number, since it uses less digits than its factorization.

10139805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17357 (or 17354 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 10139805 is about 3184.3060468491. The cubic root of 10139805 is about 216.4428286620.

The spelling of 10139805 in words is "ten million, one hundred thirty-nine thousand, eight hundred five".