133539228 has 18 divisors (see below), whose sum is σ = 337557584. Its totient is φ = 44513064.

The previous prime is 133539223. The next prime is 133539247. The reversal of 133539228 is 822935331.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 3709423 = 133539228 / (1 + 3 + 3 + 5 + 3 + 9 + 2 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 133539192 and 133539201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133539223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1854676 + ... + 1854747.

Almost surely, 2^133539228 is an apocalyptic number.

133539228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

133539228 is an abundant number, since it is smaller than the sum of its proper divisors (204018356).

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

133539228 is a wasteful number, since it uses less digits than its factorization.

133539228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3709433 (or 3709428 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 133539228 is about 11555.9174451880. The cubic root of 133539228 is about 511.1357847292.

The spelling of 133539228 in words is "one hundred thirty-three million, five hundred thirty-nine thousand, two hundred twenty-eight".