8440521 has 4 divisors (see below), whose sum is σ = 11254032. Its totient is φ = 5627012.

The previous prime is 8440511. The next prime is 8440529. The reversal of 8440521 is 1250448.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8440521 - 2⁶ = 8440457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8440491 and 8440500.

It is not an unprimeable number, because it can be changed into a prime (8440529) 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, 1406751 + ... + 1406756.

It is an arithmetic number, because the mean of its divisors is an integer number (2813508).

Almost surely, 2^8440521 is an apocalyptic number.

It is an amenable number.

8440521 is a deficient number, since it is larger than the sum of its proper divisors (2813511).

8440521 is a wasteful number, since it uses less digits than its factorization.

8440521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2813510.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 8440521 is about 2905.2574756809. The cubic root of 8440521 is about 203.6056153991.

Adding to 8440521 its reverse (1250448), we get a palindrome (9690969).

The spelling of 8440521 in words is "eight million, four hundred forty thousand, five hundred twenty-one".