13859921 has 4 divisors (see below), whose sum is σ = 14026992. Its totient is φ = 13692852.

The previous prime is 13859917. The next prime is 13859929. The reversal of 13859921 is 12995831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12995831 = 191 ⋅68041.

It is a cyclic number.

It is not a de Polignac number, because 13859921 - 2² = 13859917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13859929) 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, 83411 + ... + 83576.

It is an arithmetic number, because the mean of its divisors is an integer number (3506748).

Almost surely, 2^13859921 is an apocalyptic number.

It is an amenable number.

13859921 is a deficient number, since it is larger than the sum of its proper divisors (167071).

13859921 is an equidigital number, since it uses as much as digits as its factorization.

13859921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167070.

The product of its digits is 19440, while the sum is 38.

The square root of 13859921 is about 3722.8914837798. The cubic root of 13859921 is about 240.2076963648.

The spelling of 13859921 in words is "thirteen million, eight hundred fifty-nine thousand, nine hundred twenty-one".