13889440 has 48 divisors (see below), whose sum is σ = 33530112. Its totient is φ = 5434624.

The previous prime is 13889423. The next prime is 13889441. The reversal of 13889440 is 4498831.

It is a self number, because there is not a number n which added to its sum of digits gives 13889440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13889441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6597 + ... + 8443.

It is an arithmetic number, because the mean of its divisors is an integer number (698544).

Almost surely, 2^13889440 is an apocalyptic number.

13889440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13889440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16765056).

13889440 is an abundant number, since it is smaller than the sum of its proper divisors (19640672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13889440 is a wasteful number, since it uses less digits than its factorization.

13889440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1909 (or 1901 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 13889440 is about 3726.8539010806. The cubic root of 13889440 is about 240.3781077016.

The spelling of 13889440 in words is "thirteen million, eight hundred eighty-nine thousand, four hundred forty".