810139 has 8 divisors (see below), whose sum is σ = 903168. Its totient is φ = 720360.

The previous prime is 810137. The next prime is 810149. The reversal of 810139 is 931018.

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

It is a cyclic number.

It is not a de Polignac number, because 810139 - 2¹ = 810137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (810137) 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 7 ways as a sum of consecutive naturals, for example, 267 + ... + 1300.

It is an arithmetic number, because the mean of its divisors is an integer number (112896).

2⁸¹⁰¹³⁹ is an apocalyptic number.

810139 is a deficient number, since it is larger than the sum of its proper divisors (93029).

810139 is a wasteful number, since it uses less digits than its factorization.

810139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 810139 is about 900.0772189096. The cubic root of 810139 is about 93.2223070381. Note that the first 3 decimals are identical.

It can be divided in two parts, 810 and 139, that added together give a palindrome (949).

The spelling of 810139 in words is "eight hundred ten thousand, one hundred thirty-nine".