13989889 has 4 divisors (see below), whose sum is σ = 14011056. Its totient is φ = 13968724.

The previous prime is 13989869. The next prime is 13989907. The reversal of 13989889 is 98898931.

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: 98898931 = 8699 ⋅11369.

It is a cyclic number.

It is not a de Polignac number, because 13989889 - 2¹⁹ = 13465601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13989869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9559 + ... + 10924.

It is an arithmetic number, because the mean of its divisors is an integer number (3502764).

Almost surely, 2^13989889 is an apocalyptic number.

It is an amenable number.

13989889 is a deficient number, since it is larger than the sum of its proper divisors (21167).

13989889 is an equidigital number, since it uses as much as digits as its factorization.

13989889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21166.

The product of its digits is 1119744, while the sum is 55.

The square root of 13989889 is about 3740.3060035243. The cubic root of 13989889 is about 240.9561911382.

It can be divided in two parts, 13989 and 889, that added together give a triangular number (14878 = T₁₇₂).

The spelling of 13989889 in words is "thirteen million, nine hundred eighty-nine thousand, eight hundred eighty-nine".