13971806 has 16 divisors (see below), whose sum is σ = 21614688. Its totient is φ = 6770400.

The previous prime is 13971791. The next prime is 13971809. The reversal of 13971806 is 60817931.

It is a super-2 number, since 2×13971806² = 390422725803272, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13971809) 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 7 ways as a sum of consecutive naturals, for example, 7856 + ... + 9468.

It is an arithmetic number, because the mean of its divisors is an integer number (1350918).

Almost surely, 2^13971806 is an apocalyptic number.

13971806 is a deficient number, since it is larger than the sum of its proper divisors (7642882).

13971806 is a wasteful number, since it uses less digits than its factorization.

13971806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 13971806 is about 3737.8879062915. The cubic root of 13971806 is about 240.8523282818.

The spelling of 13971806 in words is "thirteen million, nine hundred seventy-one thousand, eight hundred six".