13889421 has 32 divisors (see below), whose sum is σ = 25329920. Its totient is φ = 7324992.

The previous prime is 13889417. The next prime is 13889423. The reversal of 13889421 is 12498831.

It is not a de Polignac number, because 13889421 - 2² = 13889417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13889423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 370 + ... + 5283.

It is an arithmetic number, because the mean of its divisors is an integer number (791560).

Almost surely, 2^13889421 is an apocalyptic number.

It is an amenable number.

13889421 is a deficient number, since it is larger than the sum of its proper divisors (11440499).

13889421 is a wasteful number, since it uses less digits than its factorization.

13889421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5682 (or 5676 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 13889421 is about 3726.8513520128. The cubic root of 13889421 is about 240.3779980935.

The spelling of 13889421 in words is "thirteen million, eight hundred eighty-nine thousand, four hundred twenty-one".