13921939 has 4 divisors (see below), whose sum is σ = 14045256. Its totient is φ = 13798624.

The previous prime is 13921937. The next prime is 13921949. The reversal of 13921939 is 93912931.

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 13921939 - 2¹ = 13921937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13921898 and 13921907.

It is not an unprimeable number, because it can be changed into a prime (13921937) 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, 61489 + ... + 61714.

It is an arithmetic number, because the mean of its divisors is an integer number (3511314).

Almost surely, 2^13921939 is an apocalyptic number.

13921939 is a deficient number, since it is larger than the sum of its proper divisors (123317).

13921939 is a wasteful number, since it uses less digits than its factorization.

13921939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123316.

The product of its digits is 13122, while the sum is 37.

The square root of 13921939 is about 3731.2114654627. The cubic root of 13921939 is about 240.5654433816.

The spelling of 13921939 in words is "thirteen million, nine hundred twenty-one thousand, nine hundred thirty-nine".