133438 has 8 divisors (see below), whose sum is σ = 202032. Its totient is φ = 66096.

The previous prime is 133417. The next prime is 133439. The reversal of 133438 is 834331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133439) by changing a digit.

133438 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31 + ... + 517.

It is an arithmetic number, because the mean of its divisors is an integer number (25254).

2¹³³⁴³⁸ is an apocalyptic number.

133438 is a deficient number, since it is larger than the sum of its proper divisors (68594).

133438 is a wasteful number, since it uses less digits than its factorization.

133438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626.

The product of its digits is 864, while the sum is 22.

The square root of 133438 is about 365.2916642903. The cubic root of 133438 is about 51.1006598388.

Adding to 133438 its reverse (834331), we get a palindrome (967769).

The spelling of 133438 in words is "one hundred thirty-three thousand, four hundred thirty-eight".