13806287 has 4 divisors (see below), whose sum is σ = 15061416. Its totient is φ = 12551160.

The previous prime is 13806283. The next prime is 13806319. The reversal of 13806287 is 78260831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78260831 = 11 ⋅7114621.

It is a cyclic number.

It is not a de Polignac number, because 13806287 - 2² = 13806283 is a prime.

It is a super-2 number, since 2×13806287² = 381227121452738, 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 (13806281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 627548 + ... + 627569.

It is an arithmetic number, because the mean of its divisors is an integer number (3765354).

Almost surely, 2^13806287 is an apocalyptic number.

13806287 is a deficient number, since it is larger than the sum of its proper divisors (1255129).

13806287 is a wasteful number, since it uses less digits than its factorization.

13806287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255128.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 13806287 is about 3715.6812295998. The cubic root of 13806287 is about 239.8974504008.

It can be divided in two parts, 1380 and 6287, that added together give a palindrome (7667).

The spelling of 13806287 in words is "thirteen million, eight hundred six thousand, two hundred eighty-seven".