13928621 has 4 divisors (see below), whose sum is σ = 15918432. Its totient is φ = 11938812.

The previous prime is 13928611. The next prime is 13928623. The reversal of 13928621 is 12682931.

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: 12682931 = 157 ⋅80783.

It is a cyclic number.

It is not a de Polignac number, because 13928621 - 2²² = 9734317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13928623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 994895 + ... + 994908.

It is an arithmetic number, because the mean of its divisors is an integer number (3979608).

Almost surely, 2^13928621 is an apocalyptic number.

It is an amenable number.

13928621 is a deficient number, since it is larger than the sum of its proper divisors (1989811).

13928621 is an equidigital number, since it uses as much as digits as its factorization.

13928621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1989810.

The product of its digits is 5184, while the sum is 32.

The square root of 13928621 is about 3732.1067776793. The cubic root of 13928621 is about 240.6039246398.

The spelling of 13928621 in words is "thirteen million, nine hundred twenty-eight thousand, six hundred twenty-one".