13681215 has 24 divisors (see below), whose sum is σ = 24120720. Its totient is φ = 7171584.

The previous prime is 13681211. The next prime is 13681219. The reversal of 13681215 is 51218631.

13681215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (13681211) and next prime (13681219).

It is not a de Polignac number, because 13681215 - 2² = 13681211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13681211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79 + ... + 5231.

It is an arithmetic number, because the mean of its divisors is an integer number (1005030).

Almost surely, 2^13681215 is an apocalyptic number.

13681215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13681215 is a deficient number, since it is larger than the sum of its proper divisors (10439505).

13681215 is a wasteful number, since it uses less digits than its factorization.

13681215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5223 (or 5220 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 13681215 is about 3698.8126473235. The cubic root of 13681215 is about 239.1708365824.

Adding to 13681215 its reverse (51218631), we get a palindrome (64899846).

The spelling of 13681215 in words is "thirteen million, six hundred eighty-one thousand, two hundred fifteen".