12187813 has 8 divisors (see below), whose sum is σ = 13346496. Its totient is φ = 11037600.

The previous prime is 12187811. The next prime is 12187817. The reversal of 12187813 is 31878121.

It is a happy number.

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 12187813 - 2¹ = 12187811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12187811) 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, 1120 + ... + 5062.

It is an arithmetic number, because the mean of its divisors is an integer number (1668312).

Almost surely, 2^12187813 is an apocalyptic number.

It is an amenable number.

12187813 is a deficient number, since it is larger than the sum of its proper divisors (1158683).

12187813 is a wasteful number, since it uses less digits than its factorization.

12187813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4235.

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

The square root of 12187813 is about 3491.1048394455. The cubic root of 12187813 is about 230.1310721085.

The spelling of 12187813 in words is "twelve million, one hundred eighty-seven thousand, eight hundred thirteen".