810123 has 12 divisors (see below), whose sum is σ = 1120104. Its totient is φ = 520800.

The previous prime is 810109. The next prime is 810137. The reversal of 810123 is 321018.

It is a happy number.

810123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (810109) and next prime (810137).

It is not a de Polignac number, because 810123 - 2⁵ = 810091 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (810193) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2743 + ... + 3023.

It is an arithmetic number, because the mean of its divisors is an integer number (93342).

2⁸¹⁰¹²³ is an apocalyptic number.

810123 is a deficient number, since it is larger than the sum of its proper divisors (309981).

810123 is a wasteful number, since it uses less digits than its factorization.

810123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 810123 is about 900.0683307394. The cubic root of 810123 is about 93.2216933299.

The spelling of 810123 in words is "eight hundred ten thousand, one hundred twenty-three".