12511540 has 48 divisors (see below), whose sum is σ = 27941760. Its totient is φ = 4695680.

The previous prime is 12511537. The next prime is 12511553. The reversal of 12511540 is 4511521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26910 + ... + 27370.

It is an arithmetic number, because the mean of its divisors is an integer number (582120).

Almost surely, 2^12511540 is an apocalyptic number.

12511540 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 12511540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13970880).

12511540 is an abundant number, since it is smaller than the sum of its proper divisors (15430220).

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

12511540 is a wasteful number, since it uses less digits than its factorization.

12511540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 12511540 is about 3537.1655318913. The cubic root of 12511540 is about 232.1508382942.

Subtracting from 12511540 its sum of digits (19), we obtain a palindrome (12511521).

The spelling of 12511540 in words is "twelve million, five hundred eleven thousand, five hundred forty".