12357540 has 72 divisors (see below), whose sum is σ = 40375608. Its totient is φ = 3041280.

The previous prime is 12357539. The next prime is 12357557. The reversal of 12357540 is 4575321.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 79524 + 12278016 = 282^2 + 3504^2 .

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 23 ways as a sum of consecutive naturals, for example, 301 + ... + 4980.

Almost surely, 2^12357540 is an apocalyptic number.

12357540 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 12357540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20187804).

12357540 is an abundant number, since it is smaller than the sum of its proper divisors (28018068).

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

12357540 is a wasteful number, since it uses less digits than its factorization.

12357540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5309 (or 5304 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 12357540 is about 3515.3292875633. The cubic root of 12357540 is about 231.1944166386.

The spelling of 12357540 in words is "twelve million, three hundred fifty-seven thousand, five hundred forty".