133121928 has 32 divisors (see below), whose sum is σ = 336549600. Its totient is φ = 43874688.

The previous prime is 133121899. The next prime is 133121929. The reversal of 133121928 is 829121331.

It is a junction number, because it is equal to n+sod(n) for n = 133121895 and 133121904.

It is not an unprimeable number, because it can be changed into a prime (133121929) 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, 29026 + ... + 33297.

It is an arithmetic number, because the mean of its divisors is an integer number (10517175).

Almost surely, 2^133121928 is an apocalyptic number.

It is an amenable number.

133121928 is an abundant number, since it is smaller than the sum of its proper divisors (203427672).

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

133121928 is a wasteful number, since it uses less digits than its factorization.

133121928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62421 (or 62417 counting only the distinct ones).

The product of its digits is 2592, while the sum is 30.

The square root of 133121928 is about 11537.8476328993. The cubic root of 133121928 is about 510.6028089346.

The spelling of 133121928 in words is "one hundred thirty-three million, one hundred twenty-one thousand, nine hundred twenty-eight".