13989393 has 12 divisors (see below), whose sum is σ = 22044048. Its totient is φ = 8478360.

The previous prime is 13989389. The next prime is 13989407. The reversal of 13989393 is 39398931.

13989393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13989393 - 2² = 13989389 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13989383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70555 + ... + 70752.

It is an arithmetic number, because the mean of its divisors is an integer number (1837004).

Almost surely, 2^13989393 is an apocalyptic number.

It is an amenable number.

13989393 is a deficient number, since it is larger than the sum of its proper divisors (8054655).

13989393 is a wasteful number, since it uses less digits than its factorization.

13989393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141324 (or 141321 counting only the distinct ones).

The product of its digits is 157464, while the sum is 45.

The square root of 13989393 is about 3740.2396982012. The cubic root of 13989393 is about 240.9533434701.

The spelling of 13989393 in words is "thirteen million, nine hundred eighty-nine thousand, three hundred ninety-three".