12440531 has 4 divisors (see below), whose sum is σ = 12675312. Its totient is φ = 12205752.

The previous prime is 12440521. The next prime is 12440537. The reversal of 12440531 is 13504421.

12440531 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12440531 is a prime.

It is a super-2 number, since 2×12440531² = 309533623123922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12440537) 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, 117311 + ... + 117416.

It is an arithmetic number, because the mean of its divisors is an integer number (3168828).

Almost surely, 2^12440531 is an apocalyptic number.

12440531 is a deficient number, since it is larger than the sum of its proper divisors (234781).

12440531 is an equidigital number, since it uses as much as digits as its factorization.

12440531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234780.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 12440531 is about 3527.1136925254. The cubic root of 12440531 is about 231.7108156174.

Adding to 12440531 its reverse (13504421), we get a palindrome (25944952).

The spelling of 12440531 in words is "twelve million, four hundred forty thousand, five hundred thirty-one".