13663994 has 16 divisors (see below), whose sum is σ = 21454080. Its totient is φ = 6518880.

The previous prime is 13663967. The next prime is 13663997. The reversal of 13663994 is 49936631.

Added to its reverse (49936631) it gives a square (63600625 = 7975²).

It is not an unprimeable number, because it can be changed into a prime (13663997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3017 + ... + 6035.

It is an arithmetic number, because the mean of its divisors is an integer number (1340880).

Almost surely, 2^13663994 is an apocalyptic number.

13663994 is a deficient number, since it is larger than the sum of its proper divisors (7790086).

13663994 is a wasteful number, since it uses less digits than its factorization.

13663994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3125.

The product of its digits is 104976, while the sum is 41.

The square root of 13663994 is about 3696.4840051054. The cubic root of 13663994 is about 239.0704436878.

Adding to 13663994 its reverse (49936631), we get a square (63600625 = 7975²).

The spelling of 13663994 in words is "thirteen million, six hundred sixty-three thousand, nine hundred ninety-four".