815940 has 48 divisors (see below), whose sum is σ = 2540160. Its totient is φ = 217440.

The previous prime is 815939. The next prime is 815953. The reversal of 815940 is 49518.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216 + ... + 1295.

It is an arithmetic number, because the mean of its divisors is an integer number (52920).

2⁸¹⁵⁹⁴⁰ 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 815940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1270080).

815940 is an abundant number, since it is smaller than the sum of its proper divisors (1724220).

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

815940 is a wasteful number, since it uses less digits than its factorization.

815940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529 (or 1521 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 815940 is about 903.2939720822. The cubic root of 815940 is about 93.4442841537. Note that the first 3 decimals are identical.

The spelling of 815940 in words is "eight hundred fifteen thousand, nine hundred forty".