12215893 has 4 divisors (see below), whose sum is σ = 12383308. Its totient is φ = 12048480.

The previous prime is 12215851. The next prime is 12215897. The reversal of 12215893 is 39851221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39851221 = 41 ⋅971981.

It can be written as a sum of positive squares in 2 ways, for example, as 4915089 + 7300804 = 2217^2 + 2702^2 .

It is a cyclic number.

It is not a de Polignac number, because 12215893 - 2⁹ = 12215381 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215897) 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 3 ways as a sum of consecutive naturals, for example, 83598 + ... + 83743.

It is an arithmetic number, because the mean of its divisors is an integer number (3095827).

Almost surely, 2^12215893 is an apocalyptic number.

It is an amenable number.

12215893 is a deficient number, since it is larger than the sum of its proper divisors (167415).

12215893 is an equidigital number, since it uses as much as digits as its factorization.

12215893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167414.

The product of its digits is 4320, while the sum is 31.

The square root of 12215893 is about 3495.1241751903. The cubic root of 12215893 is about 230.3076726765.

The spelling of 12215893 in words is "twelve million, two hundred fifteen thousand, eight hundred ninety-three".