133881904 has 60 divisors (see below), whose sum is σ = 294991536. Its totient is φ = 58506624.

The previous prime is 133881871. The next prime is 133881911. The reversal of 133881904 is 409188331.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74197 + ... + 75979.

Almost surely, 2^133881904 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 133881904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147495768).

133881904 is an abundant number, since it is smaller than the sum of its proper divisors (161109632).

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

133881904 is a wasteful number, since it uses less digits than its factorization.

133881904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1842 (or 1817 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 133881904 is about 11570.7348081269. The cubic root of 133881904 is about 511.5726210574.

The spelling of 133881904 in words is "one hundred thirty-three million, eight hundred eighty-one thousand, nine hundred four".