12447540 has 192 divisors, whose sum is σ = 45964800. Its totient is φ = 2737152.

The previous prime is 12447529. The next prime is 12447541. The reversal of 12447540 is 4574421.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12447541) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 139816 + ... + 139904.

It is an arithmetic number, because the mean of its divisors is an integer number (239400).

Almost surely, 2^12447540 is an apocalyptic number.

12447540 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 12447540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22982400).

12447540 is an abundant number, since it is smaller than the sum of its proper divisors (33517260).

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

12447540 is a wasteful number, since it uses less digits than its factorization.

12447540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 12447540 is about 3528.1071412303. The cubic root of 12447540 is about 231.7543227689.

The spelling of 12447540 in words is "twelve million, four hundred forty-seven thousand, five hundred forty".