133443 has 6 divisors (see below), whose sum is σ = 192764. Its totient is φ = 88956.

The previous prime is 133439. The next prime is 133447. The reversal of 133443 is 344331.

It is an interprime number because it is at equal distance from previous prime (133439) and next prime (133447).

It is not a de Polignac number, because 133443 - 2² = 133439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133447) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7405 + ... + 7422.

2¹³³⁴⁴³ is an apocalyptic number.

133443 is a deficient number, since it is larger than the sum of its proper divisors (59321).

133443 is a wasteful number, since it uses less digits than its factorization.

133443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14833 (or 14830 counting only the distinct ones).

The product of its digits is 432, while the sum is 18.

The square root of 133443 is about 365.2985080725. The cubic root of 133443 is about 51.1012980881.

Adding to 133443 its reverse (344331), we get a palindrome (477774).

It can be divided in two parts, 133 and 443, that added together give a square (576 = 24²).

The spelling of 133443 in words is "one hundred thirty-three thousand, four hundred forty-three".