133838 has 4 divisors (see below), whose sum is σ = 200760. Its totient is φ = 66918.

The previous prime is 133831. The next prime is 133843. The reversal of 133838 is 838331.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×133838² = 35825220488, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is a plaindrome in base 14.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133831) by changing a digit.

133838 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 as a sum of consecutive naturals, namely, 33458 + ... + 33461.

It is an arithmetic number, because the mean of its divisors is an integer number (50190).

2¹³³⁸³⁸ is an apocalyptic number.

133838 is a deficient number, since it is larger than the sum of its proper divisors (66922).

133838 is an equidigital number, since it uses as much as digits as its factorization.

133838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66921.

The product of its digits is 1728, while the sum is 26.

The square root of 133838 is about 365.8387622984. The cubic root of 133838 is about 51.1516694804.

It can be divided in two parts, 13 and 3838, that multiplied together give a palindrome (49894).

The spelling of 133838 in words is "one hundred thirty-three thousand, eight hundred thirty-eight".