13981694 has 16 divisors (see below), whose sum is σ = 21457536. Its totient is φ = 6831000.

The previous prime is 13981691. The next prime is 13981727. The reversal of 13981694 is 49618931.

Added to its reverse (49618931) it gives a square (63600625 = 7975²).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13981691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19889 + ... + 20579.

It is an arithmetic number, because the mean of its divisors is an integer number (1341096).

Almost surely, 2^13981694 is an apocalyptic number.

13981694 is a deficient number, since it is larger than the sum of its proper divisors (7475842).

13981694 is a wasteful number, since it uses less digits than its factorization.

13981694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911.

The product of its digits is 46656, while the sum is 41.

The square root of 13981694 is about 3739.2103444444. The cubic root of 13981694 is about 240.9091328263.

Adding to 13981694 its reverse (49618931), we get a square (63600625 = 7975²).

The spelling of 13981694 in words is "thirteen million, nine hundred eighty-one thousand, six hundred ninety-four".