804440 has 96 divisors (see below), whose sum is σ = 2371680. Its totient is φ = 239616.

The previous prime is 804409. The next prime is 804443. The reversal of 804440 is 44408.

804440 = T₁ + T₂ + ... + T₁₆₈.

804440 is a nontrivial binomial coefficient, being equal to C(170, 3).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a nialpdrome in base 13.

It is a zygodrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 804440.

It is not an unprimeable number, because it can be changed into a prime (804443) by changing a digit.

It is the 168-th tetrahedral number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47312 + ... + 47328.

It is an arithmetic number, because the mean of its divisors is an integer number (24705).

2⁸⁰⁴⁴⁴⁰ 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 804440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1185840).

804440 is an abundant number, since it is smaller than the sum of its proper divisors (1567240).

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

804440 is a wasteful number, since it uses less digits than its factorization.

804440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61 (or 44 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 804440 is about 896.9057921543. The cubic root of 804440 is about 93.0031987184.

Adding to 804440 its reverse (44408), we get a palindrome (848848).

The spelling of 804440 in words is "eight hundred four thousand, four hundred forty".