13889549 has 4 divisors (see below), whose sum is σ = 13939260. Its totient is φ = 13839840.

The previous prime is 13889531. The next prime is 13889567. The reversal of 13889549 is 94598831.

13889549 = 67² + 68² + ... + 347².

13889549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (13889531) and next prime (13889567).

It can be written as a sum of positive squares in 2 ways, for example, as 8970025 + 4919524 = 2995^2 + 2218^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13889549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13889509) 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, 24434 + ... + 24995.

It is an arithmetic number, because the mean of its divisors is an integer number (3484815).

Almost surely, 2^13889549 is an apocalyptic number.

It is an amenable number.

13889549 is a deficient number, since it is larger than the sum of its proper divisors (49711).

13889549 is an equidigital number, since it uses as much as digits as its factorization.

13889549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49710.

The product of its digits is 311040, while the sum is 47.

The square root of 13889549 is about 3726.8685246464. The cubic root of 13889549 is about 240.3787365041.

The spelling of 13889549 in words is "thirteen million, eight hundred eighty-nine thousand, five hundred forty-nine".