12453440 has 28 divisors (see below), whose sum is σ = 29655516. Its totient is φ = 4981248.

The previous prime is 12453439. The next prime is 12453443. The reversal of 12453440 is 4435421.

It can be written as a sum of positive squares in 2 ways, for example, as 2768896 + 9684544 = 1664^2 + 3112^2 .

It is not an unprimeable number, because it can be changed into a prime (12453443) 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, 19139 + ... + 19778.

Almost surely, 2^12453440 is an apocalyptic number.

12453440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12453440 is an abundant number, since it is smaller than the sum of its proper divisors (17202076).

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

12453440 is an equidigital number, since it uses as much as digits as its factorization.

12453440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38934 (or 38924 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 12453440 is about 3528.9431845809. The cubic root of 12453440 is about 231.7909333368.

Adding to 12453440 its reverse (4435421), we get a palindrome (16888861).

The spelling of 12453440 in words is "twelve million, four hundred fifty-three thousand, four hundred forty".