12987145 has 8 divisors (see below), whose sum is σ = 15642504. Its totient is φ = 10351104.

The previous prime is 12987137. The next prime is 12987151. The reversal of 12987145 is 54178921.

It can be written as a sum of positive squares in 4 ways, for example, as 84681 + 12902464 = 291^2 + 3592^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12987145 - 2³ = 12987137 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3304 + ... + 6073.

It is an arithmetic number, because the mean of its divisors is an integer number (1955313).

Almost surely, 2^12987145 is an apocalyptic number.

It is an amenable number.

12987145 is a deficient number, since it is larger than the sum of its proper divisors (2655359).

12987145 is an equidigital number, since it uses as much as digits as its factorization.

12987145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9659.

The product of its digits is 20160, while the sum is 37.

The square root of 12987145 is about 3603.7681667943. The cubic root of 12987145 is about 235.0559396029.

The spelling of 12987145 in words is "twelve million, nine hundred eighty-seven thousand, one hundred forty-five".