133749 has 24 divisors (see below), whose sum is σ = 242112. Its totient is φ = 69120.

The previous prime is 133733. The next prime is 133769. The reversal of 133749 is 947331.

It is not a de Polignac number, because 133749 - 2⁴ = 133733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133709) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 597 + ... + 789.

It is an arithmetic number, because the mean of its divisors is an integer number (10088).

2¹³³⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

133749 is a deficient number, since it is larger than the sum of its proper divisors (108363).

133749 is a wasteful number, since it uses less digits than its factorization.

133749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 214 counting only the distinct ones).

The product of its digits is 2268, while the sum is 27.

The square root of 133749 is about 365.7171037838. The cubic root of 133749 is about 51.1403286353.

The spelling of 133749 in words is "one hundred thirty-three thousand, seven hundred forty-nine".