8255440 has 40 divisors (see below), whose sum is σ = 19719720. Its totient is φ = 3211776.

The previous prime is 8255419. The next prime is 8255447. The reversal of 8255440 is 445528.

It can be written as a sum of positive squares in 4 ways, for example, as 2742336 + 5513104 = 1656^2 + 2348^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 8255399 and 8255408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8255447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1566 + ... + 4354.

It is an arithmetic number, because the mean of its divisors is an integer number (492993).

Almost surely, 2^8255440 is an apocalyptic number.

8255440 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 8255440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9859860).

8255440 is an abundant number, since it is smaller than the sum of its proper divisors (11464280).

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

8255440 is a wasteful number, since it uses less digits than its factorization.

8255440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839 (or 2833 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 8255440 is about 2873.2281496602. The cubic root of 8255440 is about 202.1064040925.

The spelling of 8255440 in words is "eight million, two hundred fifty-five thousand, four hundred forty".