133747 has 4 divisors (see below), whose sum is σ = 135520. Its totient is φ = 131976.

The previous prime is 133733. The next prime is 133769. The reversal of 133747 is 747331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 747331 = 13 ⋅57487.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133747 is a prime.

It is a super-3 number, since 3×133747³ = 7177503334271169, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133717) 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, 768 + ... + 925.

It is an arithmetic number, because the mean of its divisors is an integer number (33880).

2¹³³⁷⁴⁷ is an apocalyptic number.

133747 is a deficient number, since it is larger than the sum of its proper divisors (1773).

133747 is an equidigital number, since it uses as much as digits as its factorization.

133747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1772.

The product of its digits is 1764, while the sum is 25.

The square root of 133747 is about 365.7143694196. The cubic root of 133747 is about 51.1400737271.

The spelling of 133747 in words is "one hundred thirty-three thousand, seven hundred forty-seven".