133391232 has 128 divisors (see below), whose sum is σ = 424116000. Its totient is φ = 41029632.

The previous prime is 133391227. The next prime is 133391243. The reversal of 133391232 is 232193331.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 133391196 and 133391205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43444 + ... + 46412.

Almost surely, 2^133391232 is an apocalyptic number.

133391232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133391232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212058000).

133391232 is an abundant number, since it is smaller than the sum of its proper divisors (290724768).

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

133391232 is a wasteful number, since it uses less digits than its factorization.

133391232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3005 (or 2987 counting only the distinct ones).

The product of its digits is 2916, while the sum is 27.

The square root of 133391232 is about 11549.5121974913. The cubic root of 133391232 is about 510.9468913853.

The spelling of 133391232 in words is "one hundred thirty-three million, three hundred ninety-one thousand, two hundred thirty-two".