133881438 has 8 divisors (see below), whose sum is σ = 267762888. Its totient is φ = 44627144.

The previous prime is 133881431. The next prime is 133881491. The reversal of 133881438 is 834188331.

It is a sphenic number, since it is the product of 3 distinct primes.

133881438 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 133881396 and 133881405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133881431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11156781 + ... + 11156792.

It is an arithmetic number, because the mean of its divisors is an integer number (33470361).

Almost surely, 2^133881438 is an apocalyptic number.

133881438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

133881438 is a wasteful number, since it uses less digits than its factorization.

133881438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22313578.

The product of its digits is 55296, while the sum is 39.

The square root of 133881438 is about 11570.7146710996. The cubic root of 133881438 is about 511.5720275166.

The spelling of 133881438 in words is "one hundred thirty-three million, eight hundred eighty-one thousand, four hundred thirty-eight".