13893921 has 24 divisors (see below), whose sum is σ = 21815040. Its totient is φ = 8488800.

The previous prime is 13893853. The next prime is 13893923. The reversal of 13893921 is 12939831.

It is not a de Polignac number, because 13893921 - 2¹⁴ = 13877537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13893923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3991 + ... + 6611.

It is an arithmetic number, because the mean of its divisors is an integer number (908960).

Almost surely, 2^13893921 is an apocalyptic number.

It is an amenable number.

13893921 is a deficient number, since it is larger than the sum of its proper divisors (7921119).

13893921 is a wasteful number, since it uses less digits than its factorization.

13893921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2677 (or 2674 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 13893921 is about 3727.4550299098. The cubic root of 13893921 is about 240.4039551196.

The spelling of 13893921 in words is "thirteen million, eight hundred ninety-three thousand, nine hundred twenty-one".