12689145 has 24 divisors (see below), whose sum is σ = 25137216. Its totient is φ = 5800608.

The previous prime is 12689143. The next prime is 12689147. The reversal of 12689145 is 54198621.

It is an interprime number because it is at equal distance from previous prime (12689143) and next prime (12689147).

It is not a de Polignac number, because 12689145 - 2¹ = 12689143 is a prime.

It is a super-2 number, since 2×12689145² = 322028801662050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12689143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19827 + ... + 20456.

It is an arithmetic number, because the mean of its divisors is an integer number (1047384).

Almost surely, 2^12689145 is an apocalyptic number.

12689145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12689145 is a deficient number, since it is larger than the sum of its proper divisors (12448071).

12689145 is a wasteful number, since it uses less digits than its factorization.

12689145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40301 (or 40298 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 12689145 is about 3562.1826174412. The cubic root of 12689145 is about 233.2441643409.

The spelling of 12689145 in words is "twelve million, six hundred eighty-nine thousand, one hundred forty-five".