13538749 has 12 divisors (see below), whose sum is σ = 16676604. Its totient is φ = 10921344.

The previous prime is 13538731. The next prime is 13538779. The reversal of 13538749 is 94783531.

It can be written as a sum of positive squares in 2 ways, for example, as 9966649 + 3572100 = 3157^2 + 1890^2 .

It is not a de Polignac number, because 13538749 - 2¹³ = 13530557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13538729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7294 + ... + 8959.

It is an arithmetic number, because the mean of its divisors is an integer number (1389717).

Almost surely, 2^13538749 is an apocalyptic number.

It is an amenable number.

13538749 is a deficient number, since it is larger than the sum of its proper divisors (3137855).

13538749 is a wasteful number, since it uses less digits than its factorization.

13538749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16284 (or 16277 counting only the distinct ones).

The product of its digits is 90720, while the sum is 40.

The square root of 13538749 is about 3679.5039067787. The cubic root of 13538749 is about 238.3377557441.

The spelling of 13538749 in words is "thirteen million, five hundred thirty-eight thousand, seven hundred forty-nine".