12487509 has 6 divisors (see below), whose sum is σ = 18037526. Its totient is φ = 8325000.

The previous prime is 12487507. The next prime is 12487523. The reversal of 12487509 is 90578421.

It can be written as a sum of positive squares in only one way, i.e., 12215025 + 272484 = 3495^2 + 522^2 .

It is not a de Polignac number, because 12487509 - 2¹ = 12487507 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12487507) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 693742 + ... + 693759.

Almost surely, 2^12487509 is an apocalyptic number.

It is an amenable number.

12487509 is a deficient number, since it is larger than the sum of its proper divisors (5550017).

12487509 is a wasteful number, since it uses less digits than its factorization.

12487509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387507 (or 1387504 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 12487509 is about 3533.7669702458. The cubic root of 12487509 is about 232.0021118020.

It can be divided in two parts, 12487 and 509, that added together give a square (12996 = 114²).

The spelling of 12487509 in words is "twelve million, four hundred eighty-seven thousand, five hundred nine".