812240 has 80 divisors (see below), whose sum is σ = 2249856. Its totient is φ = 268800.

The previous prime is 812233. The next prime is 812249. The reversal of 812240 is 42218.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812249) by changing a digit.

812240 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, 11405 + ... + 11475.

2⁸¹²²⁴⁰ is an apocalyptic number.

812240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 812240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1124928).

812240 is an abundant number, since it is smaller than the sum of its proper divisors (1437616).

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

812240 is a wasteful number, since it uses less digits than its factorization.

812240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 812240 is about 901.2435852754. The cubic root of 812240 is about 93.3028244955.

Adding to 812240 its reverse (42218), we get a palindrome (854458).

The spelling of 812240 in words is "eight hundred twelve thousand, two hundred forty".