13819939 has 4 divisors (see below), whose sum is σ = 15794224. Its totient is φ = 11845656.

The previous prime is 13819933. The next prime is 13819943. The reversal of 13819939 is 93991831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93991831 = 163 ⋅576637.

It is a cyclic number.

It is not a de Polignac number, because 13819939 - 2⁷ = 13819811 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13819895 and 13819904.

It is not an unprimeable number, because it can be changed into a prime (13819933) 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, 987132 + ... + 987145.

It is an arithmetic number, because the mean of its divisors is an integer number (3948556).

Almost surely, 2^13819939 is an apocalyptic number.

13819939 is a deficient number, since it is larger than the sum of its proper divisors (1974285).

13819939 is an equidigital number, since it uses as much as digits as its factorization.

13819939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1974284.

The product of its digits is 52488, while the sum is 43.

The square root of 13819939 is about 3717.5178546982. The cubic root of 13819939 is about 239.9764965409.

The spelling of 13819939 in words is "thirteen million, eight hundred nineteen thousand, nine hundred thirty-nine".