12252440 has 64 divisors (see below), whose sum is σ = 29272320. Its totient is φ = 4608000.

The previous prime is 12252431. The next prime is 12252469. The reversal of 12252440 is 4425221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50720 + ... + 50960.

It is an arithmetic number, because the mean of its divisors is an integer number (457380).

Almost surely, 2^12252440 is an apocalyptic number.

12252440 is a gapful number since it is divisible by the number (10) 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 12252440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14636160).

12252440 is an abundant number, since it is smaller than the sum of its proper divisors (17019880).

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

12252440 is a wasteful number, since it uses less digits than its factorization.

12252440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 12252440 is about 3500.3485540729. The cubic root of 12252440 is about 230.5371189808.

Adding to 12252440 its reverse (4425221), we get a palindrome (16677661).

The spelling of 12252440 in words is "twelve million, two hundred fifty-two thousand, four hundred forty".