12987745 has 16 divisors (see below), whose sum is σ = 16858368. Its totient is φ = 9568000.

The previous prime is 12987713. The next prime is 12987761. The reversal of 12987745 is 54778921.

It is not a de Polignac number, because 12987745 - 2⁵ = 12987713 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2370 + ... + 5620.

It is an arithmetic number, because the mean of its divisors is an integer number (1053648).

Almost surely, 2^12987745 is an apocalyptic number.

It is an amenable number.

12987745 is a deficient number, since it is larger than the sum of its proper divisors (3870623).

12987745 is a wasteful number, since it uses less digits than its factorization.

12987745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3320.

The product of its digits is 141120, while the sum is 43.

The square root of 12987745 is about 3603.8514120313. The cubic root of 12987745 is about 235.0595593718.

The spelling of 12987745 in words is "twelve million, nine hundred eighty-seven thousand, seven hundred forty-five".