13921791 has 8 divisors (see below), whose sum is σ = 19990320. Its totient is φ = 8567232.

The previous prime is 13921783. The next prime is 13921801. The reversal of 13921791 is 19712931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13921791 - 2³ = 13921783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13921771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178446 + ... + 178523.

It is an arithmetic number, because the mean of its divisors is an integer number (2498790).

Almost surely, 2^13921791 is an apocalyptic number.

13921791 is a deficient number, since it is larger than the sum of its proper divisors (6068529).

13921791 is a wasteful number, since it uses less digits than its factorization.

13921791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356985.

The product of its digits is 3402, while the sum is 33.

The square root of 13921791 is about 3731.1916327093. The cubic root of 13921791 is about 240.5645909186.

The spelling of 13921791 in words is "thirteen million, nine hundred twenty-one thousand, seven hundred ninety-one".