12689775 has 54 divisors (see below), whose sum is σ = 26462592. Its totient is φ = 5796000.

The previous prime is 12689771. The next prime is 12689783. The reversal of 12689775 is 57798621.

12689775 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12689775 - 2² = 12689771 is a prime.

It is a super-2 number, since 2×12689775² = 322060779101250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 12689775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12689771) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 10450 + ... + 11600.

It is an arithmetic number, because the mean of its divisors is an integer number (490048).

Almost surely, 2^12689775 is an apocalyptic number.

12689775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12689775 is an abundant number, since it is smaller than the sum of its proper divisors (13772817).

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

12689775 is a wasteful number, since it uses less digits than its factorization.

12689775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181 (or 1166 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 12689775 is about 3562.2710452743. The cubic root of 12689775 is about 233.2480243696.

The spelling of 12689775 in words is "twelve million, six hundred eighty-nine thousand, seven hundred seventy-five".