133431928 has 16 divisors (see below), whose sum is σ = 285925680. Its totient is φ = 57185088.

The previous prime is 133431923. The next prime is 133431941. The reversal of 133431928 is 829134331.

It is a junction number, because it is equal to n+sod(n) for n = 133431893 and 133431902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133431923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1191301 + ... + 1191412.

It is an arithmetic number, because the mean of its divisors is an integer number (17870355).

Almost surely, 2^133431928 is an apocalyptic number.

It is an amenable number.

133431928 is an abundant number, since it is smaller than the sum of its proper divisors (152493752).

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

133431928 is a wasteful number, since it uses less digits than its factorization.

133431928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2382726 (or 2382722 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 133431928 is about 11551.2738691453. The cubic root of 133431928 is about 510.9988472751.

The spelling of 133431928 in words is "one hundred thirty-three million, four hundred thirty-one thousand, nine hundred twenty-eight".