13889540 has 36 divisors (see below), whose sum is σ = 33932556. Its totient is φ = 4761792.

The previous prime is 13889531. The next prime is 13889567. The reversal of 13889540 is 4598831.

It can be written as a sum of positive squares in 2 ways, for example, as 8809024 + 5080516 = 2968^2 + 2254^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13889494 and 13889503.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6107 + ... + 8066.

It is an arithmetic number, because the mean of its divisors is an integer number (942571).

Almost surely, 2^13889540 is an apocalyptic number.

13889540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13889540 is an abundant number, since it is smaller than the sum of its proper divisors (20043016).

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

13889540 is a wasteful number, since it uses less digits than its factorization.

13889540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14196 (or 14187 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 13889540 is about 3726.8673171982. The cubic root of 13889540 is about 240.3786845848.

The spelling of 13889540 in words is "thirteen million, eight hundred eighty-nine thousand, five hundred forty".