810138 has 16 divisors (see below), whose sum is σ = 1851840. Its totient is φ = 231456.

The previous prime is 810137. The next prime is 810149. The reversal of 810138 is 831018.

It is a happy number.

810138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 810138.

It is not an unprimeable number, because it can be changed into a prime (810137) 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, 9603 + ... + 9686.

It is an arithmetic number, because the mean of its divisors is an integer number (115740).

2⁸¹⁰¹³⁸ is an apocalyptic number.

810138 is an abundant number, since it is smaller than the sum of its proper divisors (1041702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

810138 is a wasteful number, since it uses less digits than its factorization.

810138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19301.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 810138 is about 900.0766634015. The cubic root of 810138 is about 93.2222686815. Note that the first 4 decimals are identical.

The spelling of 810138 in words is "eight hundred ten thousand, one hundred thirty-eight".