133928 has 8 divisors (see below), whose sum is σ = 251130. Its totient is φ = 66960.

The previous prime is 133919. The next prime is 133949. The reversal of 133928 is 829331.

It can be written as a sum of positive squares in only one way, i.e., 77284 + 56644 = 278^2 + 238^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 133897 and 133906.

It is an unprimeable number.

133928 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8363 + ... + 8378.

2¹³³⁹²⁸ is an apocalyptic number.

It is an amenable number.

133928 is a deficient number, since it is larger than the sum of its proper divisors (117202).

133928 is a wasteful number, since it uses less digits than its factorization.

133928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16747 (or 16743 counting only the distinct ones).

The product of its digits is 1296, while the sum is 26.

The square root of 133928 is about 365.9617466348. The cubic root of 133928 is about 51.1631326391.

The spelling of 133928 in words is "one hundred thirty-three thousand, nine hundred twenty-eight".