133688196 has 18 divisors (see below), whose sum is σ = 337934142. Its totient is φ = 44562720.

The previous prime is 133688189. The next prime is 133688197. The reversal of 133688196 is 691886331.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 106502400 + 27185796 = 10320^2 + 5214^2 .

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

It is not an unprimeable number, because it can be changed into a prime (133688197) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1856745 + ... + 1856816.

It is an arithmetic number, because the mean of its divisors is an integer number (18774119).

Almost surely, 2^133688196 is an apocalyptic number.

It is an amenable number.

133688196 is an abundant number, since it is smaller than the sum of its proper divisors (204245946).

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

133688196 is a wasteful number, since it uses less digits than its factorization.

133688196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3713571 (or 3713566 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 133688196 is about 11562.3611775450. The cubic root of 133688196 is about 511.3257777893.

The spelling of 133688196 in words is "one hundred thirty-three million, six hundred eighty-eight thousand, one hundred ninety-six".