13921471 has 4 divisors (see below), whose sum is σ = 14654200. Its totient is φ = 13188744.

The previous prime is 13921451. The next prime is 13921477. The reversal of 13921471 is 17412931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17412931 = 229 ⋅76039.

It is a cyclic number.

It is not a de Polignac number, because 13921471 - 2¹³ = 13913279 is a prime.

It is a super-3 number, since 3×13921471³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13921477) 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, 366336 + ... + 366373.

It is an arithmetic number, because the mean of its divisors is an integer number (3663550).

Almost surely, 2^13921471 is an apocalyptic number.

13921471 is a deficient number, since it is larger than the sum of its proper divisors (732729).

13921471 is an equidigital number, since it uses as much as digits as its factorization.

13921471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732728.

The product of its digits is 1512, while the sum is 28.

The square root of 13921471 is about 3731.1487507201. The cubic root of 13921471 is about 240.5627477348.

The spelling of 13921471 in words is "thirteen million, nine hundred twenty-one thousand, four hundred seventy-one".