13663939 has 4 divisors (see below), whose sum is σ = 13888000. Its totient is φ = 13439880.

The previous prime is 13663933. The next prime is 13663943. The reversal of 13663939 is 93936631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93936631 = 719 ⋅130649.

It is a cyclic number.

It is not a de Polignac number, because 13663939 - 2³ = 13663931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13663931) 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 3 ways as a sum of consecutive naturals, for example, 111939 + ... + 112060.

It is an arithmetic number, because the mean of its divisors is an integer number (3472000).

Almost surely, 2^13663939 is an apocalyptic number.

13663939 is a deficient number, since it is larger than the sum of its proper divisors (224061).

13663939 is an equidigital number, since it uses as much as digits as its factorization.

13663939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224060.

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

The square root of 13663939 is about 3696.4765655959. The cubic root of 13663939 is about 239.0701229204.

The spelling of 13663939 in words is "thirteen million, six hundred sixty-three thousand, nine hundred thirty-nine".