13897186 has 4 divisors (see below), whose sum is σ = 20845782. Its totient is φ = 6948592.

The previous prime is 13897181. The next prime is 13897187. The reversal of 13897186 is 68179831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68179831 = 137 ⋅497663.

It can be written as a sum of positive squares in only one way, i.e., 12033961 + 1863225 = 3469^2 + 1365^2 .

It is not an unprimeable number, because it can be changed into a prime (13897181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3474295 + ... + 3474298.

Almost surely, 2^13897186 is an apocalyptic number.

13897186 is a deficient number, since it is larger than the sum of its proper divisors (6948596).

13897186 is an equidigital number, since it uses as much as digits as its factorization.

13897186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6948595.

The product of its digits is 72576, while the sum is 43.

The square root of 13897186 is about 3727.8929705666. The cubic root of 13897186 is about 240.4227848759.

The spelling of 13897186 in words is "thirteen million, eight hundred ninety-seven thousand, one hundred eighty-six".