12451840 has 72 divisors (see below), whose sum is σ = 31457160. Its totient is φ = 4718592.

The previous prime is 12451807. The next prime is 12451841. The reversal of 12451840 is 4815421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12451841) 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, 655351 + ... + 655369.

It is an arithmetic number, because the mean of its divisors is an integer number (436905).

Almost surely, 2^12451840 is an apocalyptic number.

12451840 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 12451840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15728580).

12451840 is an abundant number, since it is smaller than the sum of its proper divisors (19005320).

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

12451840 is an frugal number, since it uses more digits than its factorization.

12451840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58 (or 26 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 12451840 is about 3528.7164805351. The cubic root of 12451840 is about 231.7810061901.

The spelling of 12451840 in words is "twelve million, four hundred fifty-one thousand, eight hundred forty".