133831812 has 24 divisors (see below), whose sum is σ = 320715136. Its totient is φ = 43404768.

The previous prime is 133831807. The next prime is 133831813. The reversal of 133831812 is 218138331.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 133831812.

It is not an unprimeable number, because it can be changed into a prime (133831813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150268 + ... + 151155.

Almost surely, 2^133831812 is an apocalyptic number.

133831812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

133831812 is an abundant number, since it is smaller than the sum of its proper divisors (186883324).

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

133831812 is a wasteful number, since it uses less digits than its factorization.

133831812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301467 (or 301465 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 133831812 is about 11568.5700067035. The cubic root of 133831812 is about 511.5088113575.

The spelling of 133831812 in words is "one hundred thirty-three million, eight hundred thirty-one thousand, eight hundred twelve".