12687945 has 8 divisors (see below), whose sum is σ = 20300736. Its totient is φ = 6766896.

The previous prime is 12687943. The next prime is 12687947. The reversal of 12687945 is 54978621.

It is an interprime number because it is at equal distance from previous prime (12687943) and next prime (12687947).

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

It is not a de Polignac number, because 12687945 - 2¹ = 12687943 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 12687897 and 12687906.

It is not an unprimeable number, because it can be changed into a prime (12687943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 422917 + ... + 422946.

It is an arithmetic number, because the mean of its divisors is an integer number (2537592).

Almost surely, 2^12687945 is an apocalyptic number.

12687945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12687945 is a deficient number, since it is larger than the sum of its proper divisors (7612791).

12687945 is an equidigital number, since it uses as much as digits as its factorization.

12687945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845871.

The product of its digits is 120960, while the sum is 42.

The square root of 12687945 is about 3562.0141774002. The cubic root of 12687945 is about 233.2368115518.

The spelling of 12687945 in words is "twelve million, six hundred eighty-seven thousand, nine hundred forty-five".