12547740 has 48 divisors (see below), whose sum is σ = 35376768. Its totient is φ = 3322944.

The previous prime is 12547729. The next prime is 12547747. The reversal of 12547740 is 4774521.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 12547698 and 12547707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12547747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9139 + ... + 10421.

It is an arithmetic number, because the mean of its divisors is an integer number (737016).

Almost surely, 2^12547740 is an apocalyptic number.

12547740 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 12547740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17688384).

12547740 is an abundant number, since it is smaller than the sum of its proper divisors (22829028).

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

12547740 is a wasteful number, since it uses less digits than its factorization.

12547740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458 (or 1456 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 12547740 is about 3542.2789274703. The cubic root of 12547740 is about 232.3745189470.

The spelling of 12547740 in words is "twelve million, five hundred forty-seven thousand, seven hundred forty".