133921684 has 18 divisors (see below), whose sum is σ = 253778910. Its totient is φ = 61809696.

The previous prime is 133921679. The next prime is 133921687. The reversal of 133921684 is 486129331.

It can be written as a sum of positive squares in 3 ways, for example, as 3459600 + 130462084 = 1860^2 + 11422^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133921687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 98379 + ... + 99730.

Almost surely, 2^133921684 is an apocalyptic number.

It is an amenable number.

133921684 is a deficient number, since it is larger than the sum of its proper divisors (119857226).

133921684 is a wasteful number, since it uses less digits than its factorization.

133921684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198139 (or 198124 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 133921684 is about 11572.4536724067. The cubic root of 133921684 is about 511.6232834771.

The spelling of 133921684 in words is "one hundred thirty-three million, nine hundred twenty-one thousand, six hundred eighty-four".