133421808 has 160 divisors (see below), whose sum is σ = 393099840. Its totient is φ = 38707200.

The previous prime is 133421801. The next prime is 133421839. The reversal of 133421808 is 808124331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133421801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1320958 + ... + 1321058.

It is an arithmetic number, because the mean of its divisors is an integer number (2456874).

Almost surely, 2^133421808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133421808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196549920).

133421808 is an abundant number, since it is smaller than the sum of its proper divisors (259678032).

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

133421808 is a wasteful number, since it uses less digits than its factorization.

133421808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 133421808 is about 11550.8358139141. The cubic root of 133421808 is about 510.9859282305.

The spelling of 133421808 in words is "one hundred thirty-three million, four hundred twenty-one thousand, eight hundred eight".