12252640 has 24 divisors (see below), whose sum is σ = 28947240. Its totient is φ = 4900992.

The previous prime is 12252637. The next prime is 12252641. The reversal of 12252640 is 4625221.

12252640 = 13² + 14² + ... + 332².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12252641) 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, 38130 + ... + 38449.

It is an arithmetic number, because the mean of its divisors is an integer number (1206135).

Almost surely, 2^12252640 is an apocalyptic number.

12252640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12252640 is an abundant number, since it is smaller than the sum of its proper divisors (16694600).

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

12252640 is an equidigital number, since it uses as much as digits as its factorization.

12252640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76594 (or 76586 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 12252640 is about 3500.3771225398. The cubic root of 12252640 is about 230.5383733479.

Adding to 12252640 its reverse (4625221), we get a palindrome (16877861).

The spelling of 12252640 in words is "twelve million, two hundred fifty-two thousand, six hundred forty".