13939663 has 4 divisors (see below), whose sum is σ = 13958560. Its totient is φ = 13920768.

The previous prime is 13939661. The next prime is 13939669. The reversal of 13939663 is 36693931.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13939663 - 2¹ = 13939661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13939661) 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, 8295 + ... + 9832.

It is an arithmetic number, because the mean of its divisors is an integer number (3489640).

Almost surely, 2^13939663 is an apocalyptic number.

13939663 is a deficient number, since it is larger than the sum of its proper divisors (18897).

13939663 is an equidigital number, since it uses as much as digits as its factorization.

13939663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18896.

The product of its digits is 78732, while the sum is 40.

The square root of 13939663 is about 3733.5858099152. The cubic root of 13939663 is about 240.6674879266.

The spelling of 13939663 in words is "thirteen million, nine hundred thirty-nine thousand, six hundred sixty-three".