12587440 has 40 divisors (see below), whose sum is σ = 30542688. Its totient is φ = 4815360.

The previous prime is 12587401. The next prime is 12587441. The reversal of 12587440 is 4478521.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (12587441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1581 + ... + 5260.

Almost surely, 2^12587440 is an apocalyptic number.

12587440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12587440 is an abundant number, since it is smaller than the sum of its proper divisors (17955248).

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

12587440 is a wasteful number, since it uses less digits than its factorization.

12587440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6877 (or 6871 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 12587440 is about 3547.8782391734. The cubic root of 12587440 is about 232.6193321204.

The spelling of 12587440 in words is "twelve million, five hundred eighty-seven thousand, four hundred forty".