13989409 has 16 divisors (see below), whose sum is σ = 16528896. Its totient is φ = 11592000.

The previous prime is 13989407. The next prime is 13989421. The reversal of 13989409 is 90498931.

13989409 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13989409 - 2¹ = 13989407 is a prime.

It is a super-3 number, since 3×13989409³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

13989409 is strictly pandigital in base 8.

It is not an unprimeable number, because it can be changed into a prime (13989407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33019 + ... + 33439.

It is an arithmetic number, because the mean of its divisors is an integer number (1033056).

Almost surely, 2^13989409 is an apocalyptic number.

It is an amenable number.

13989409 is a deficient number, since it is larger than the sum of its proper divisors (2539487).

13989409 is a wasteful number, since it uses less digits than its factorization.

13989409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 13989409 is about 3740.2418371009. The cubic root of 13989409 is about 240.9534353314.

The spelling of 13989409 in words is "thirteen million, nine hundred eighty-nine thousand, four hundred nine".