810040 has 64 divisors (see below), whose sum is σ = 2280960. Its totient is φ = 251520.

The previous prime is 810023. The next prime is 810049. The reversal of 810040 is 40018.

It is a self number, because there is not a number n which added to its sum of digits gives 810040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810049) by changing a digit.

810040 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2949 + ... + 3211.

It is an arithmetic number, because the mean of its divisors is an integer number (35640).

2⁸¹⁰⁰⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 810040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1140480).

810040 is an abundant number, since it is smaller than the sum of its proper divisors (1470920).

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

810040 is a wasteful number, since it uses less digits than its factorization.

810040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 810040 is about 900.0222219479. The cubic root of 810040 is about 93.2185095892.

Adding to 810040 its reverse (40018), we get a palindrome (850058).

The spelling of 810040 in words is "eight hundred ten thousand, forty".