13921793 has 8 divisors (see below), whose sum is σ = 14819112. Its totient is φ = 13033216.

The previous prime is 13921783. The next prime is 13921801. The reversal of 13921793 is 39712931.

It can be written as a sum of positive squares in 4 ways, for example, as 7711729 + 6210064 = 2777^2 + 2492^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 13921793 - 2⁴ = 13921777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13921703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1271 + ... + 5427.

It is an arithmetic number, because the mean of its divisors is an integer number (1852389).

Almost surely, 2^13921793 is an apocalyptic number.

It is an amenable number.

13921793 is a deficient number, since it is larger than the sum of its proper divisors (897319).

13921793 is a wasteful number, since it uses less digits than its factorization.

13921793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4371.

The product of its digits is 10206, while the sum is 35.

The square root of 13921793 is about 3731.1919007202. The cubic root of 13921793 is about 240.5646024384.

The spelling of 13921793 in words is "thirteen million, nine hundred twenty-one thousand, seven hundred ninety-three".