8440540 has 48 divisors (see below), whose sum is σ = 18869760. Its totient is φ = 3164480.

The previous prime is 8440529. The next prime is 8440559. The reversal of 8440540 is 450448.

It is a congruent number.

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, 26985 + ... + 27295.

It is an arithmetic number, because the mean of its divisors is an integer number (393120).

Almost surely, 2^8440540 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 8440540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9434880).

8440540 is an abundant number, since it is smaller than the sum of its proper divisors (10429220).

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

8440540 is a wasteful number, since it uses less digits than its factorization.

8440540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 8440540 is about 2905.2607456130. The cubic root of 8440540 is about 203.6057681742.

Adding to 8440540 its reverse (450448), we get a palindrome (8890988).

The spelling of 8440540 in words is "eight million, four hundred forty thousand, five hundred forty".