133805172 has 24 divisors (see below), whose sum is σ = 320651296. Its totient is φ = 43396128.

The previous prime is 133805123. The next prime is 133805179. The reversal of 133805172 is 271508331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133805179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150238 + ... + 151125.

Almost surely, 2^133805172 is an apocalyptic number.

133805172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

133805172 is an abundant number, since it is smaller than the sum of its proper divisors (186846124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133805172 is a wasteful number, since it uses less digits than its factorization.

133805172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301407 (or 301405 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 133805172 is about 11567.4185538520. The cubic root of 133805172 is about 511.4748695047.

The spelling of 133805172 in words is "one hundred thirty-three million, eight hundred five thousand, one hundred seventy-two".