818240 has 28 divisors (see below), whose sum is σ = 1949196. Its totient is φ = 327168.

The previous prime is 818239. The next prime is 818249. The reversal of 818240 is 42818.

It can be written as a sum of positive squares in 2 ways, for example, as 322624 + 495616 = 568^2 + 704^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 959 + ... + 1598.

2⁸¹⁸²⁴⁰ is an apocalyptic number.

818240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

818240 is an abundant number, since it is smaller than the sum of its proper divisors (1130956).

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

818240 is a wasteful number, since it uses less digits than its factorization.

818240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2574 (or 2564 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 818240 is about 904.5661943716. The cubic root of 818240 is about 93.5320031144.

The spelling of 818240 in words is "eight hundred eighteen thousand, two hundred forty".