12817381 has 8 divisors (see below), whose sum is σ = 13714400. Its totient is φ = 11942640.

The previous prime is 12817373. The next prime is 12817421. The reversal of 12817381 is 18371821.

It is a happy number.

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

It is not a de Polignac number, because 12817381 - 2³ = 12817373 is a prime.

It is a super-2 number, since 2×12817381² = 328570511398322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12817081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4371 + ... + 6688.

It is an arithmetic number, because the mean of its divisors is an integer number (1714300).

Almost surely, 2^12817381 is an apocalyptic number.

It is an amenable number.

12817381 is a deficient number, since it is larger than the sum of its proper divisors (897019).

12817381 is a wasteful number, since it uses less digits than its factorization.

12817381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11139.

The product of its digits is 2688, while the sum is 31.

The square root of 12817381 is about 3580.1370085515. The cubic root of 12817381 is about 234.0272510693.

The spelling of 12817381 in words is "twelve million, eight hundred seventeen thousand, three hundred eighty-one".