12681669 has 64 divisors (see below), whose sum is σ = 23482368. Its totient is φ = 5875200.

The previous prime is 12681631. The next prime is 12681703. The reversal of 12681669 is 96618621.

12681669 = T₁₄₂ + T₁₄₃ + ... + T₄₂₈.

12681669 = 207² + 208² + ... + 360².

It is not a de Polignac number, because 12681669 - 2²⁰ = 11633093 is a prime.

It is a super-2 number, since 2×12681669² = 321649457251122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12681619) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 123072 + ... + 123174.

It is an arithmetic number, because the mean of its divisors is an integer number (366912).

Almost surely, 2^12681669 is an apocalyptic number.

It is an amenable number.

12681669 is a deficient number, since it is larger than the sum of its proper divisors (10800699).

12681669 is a wasteful number, since it uses less digits than its factorization.

12681669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178.

The product of its digits is 31104, while the sum is 39.

The square root of 12681669 is about 3561.1331061897. The cubic root of 12681669 is about 233.1983489101.

The spelling of 12681669 in words is "twelve million, six hundred eighty-one thousand, six hundred sixty-nine".