12487640 has 64 divisors (see below), whose sum is σ = 31065120. Its totient is φ = 4480000.

The previous prime is 12487627. The next prime is 12487691. The reversal of 12487640 is 4678421.

It is a junction number, because it is equal to n+sod(n) for n = 12487597 and 12487606.

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, 44300 + ... + 44580.

Almost surely, 2^12487640 is an apocalyptic number.

12487640 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 12487640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15532560).

12487640 is an abundant number, since it is smaller than the sum of its proper divisors (18577480).

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

12487640 is a wasteful number, since it uses less digits than its factorization.

12487640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 12487640 is about 3533.7855056582. The cubic root of 12487640 is about 232.0029230706.

It can be divided in two parts, 1248 and 7640, that added together give a palindrome (8888).

The spelling of 12487640 in words is "twelve million, four hundred eighty-seven thousand, six hundred forty".