133858 has 16 divisors (see below), whose sum is σ = 221184. Its totient is φ = 60480.

The previous prime is 133853. The next prime is 133873. The reversal of 133858 is 858331.

133858 = T₇₇ + T₇₈ + ... + T₁₀₇.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 991 + ... + 1117.

It is an arithmetic number, because the mean of its divisors is an integer number (13824).

2¹³³⁸⁵⁸ is an apocalyptic number.

133858 is a deficient number, since it is larger than the sum of its proper divisors (87326).

133858 is a wasteful number, since it uses less digits than its factorization.

133858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177.

The product of its digits is 2880, while the sum is 28.

The square root of 133858 is about 365.8660957236. The cubic root of 133858 is about 51.1542172930.

The spelling of 133858 in words is "one hundred thirty-three thousand, eight hundred fifty-eight".