12686421 has 8 divisors (see below), whose sum is σ = 18453024. Its totient is φ = 7688720.

The previous prime is 12686417. The next prime is 12686423. The reversal of 12686421 is 12468621.

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 12686421 - 2² = 12686417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12686423) 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, 192186 + ... + 192251.

It is an arithmetic number, because the mean of its divisors is an integer number (2306628).

Almost surely, 2^12686421 is an apocalyptic number.

12686421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12686421 is a deficient number, since it is larger than the sum of its proper divisors (5766603).

12686421 is a wasteful number, since it uses less digits than its factorization.

12686421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384451.

The product of its digits is 4608, while the sum is 30.

The square root of 12686421 is about 3561.8002470661. The cubic root of 12686421 is about 233.2274728413.

The spelling of 12686421 in words is "twelve million, six hundred eighty-six thousand, four hundred twenty-one".