133478 has 4 divisors (see below), whose sum is σ = 200220. Its totient is φ = 66738.

The previous prime is 133451. The next prime is 133481. The reversal of 133478 is 874331.

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

It is a Curzon number.

It is a plaindrome in base 10.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 33368 + ... + 33371.

It is an arithmetic number, because the mean of its divisors is an integer number (50055).

2¹³³⁴⁷⁸ is an apocalyptic number.

133478 is a deficient number, since it is larger than the sum of its proper divisors (66742).

133478 is an equidigital number, since it uses as much as digits as its factorization.

133478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66741.

The product of its digits is 2016, while the sum is 26.

The square root of 133478 is about 365.3464109581. The cubic root of 133478 is about 51.1057653864.

The spelling of 133478 in words is "one hundred thirty-three thousand, four hundred seventy-eight".