133843921 has 8 divisors (see below), whose sum is σ = 139273344. Its totient is φ = 128522160.

The previous prime is 133843883. The next prime is 133843937. The reversal of 133843921 is 129348331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133843921 - 2⁷ = 133843793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133843951) 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 7 ways as a sum of consecutive naturals, for example, 24375 + ... + 29356.

It is an arithmetic number, because the mean of its divisors is an integer number (17409168).

Almost surely, 2^133843921 is an apocalyptic number.

It is an amenable number.

133843921 is a deficient number, since it is larger than the sum of its proper divisors (5429423).

133843921 is an equidigital number, since it uses as much as digits as its factorization.

133843921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53831.

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

The square root of 133843921 is about 11569.0933525493. The cubic root of 133843921 is about 511.5242378676.

The spelling of 133843921 in words is "one hundred thirty-three million, eight hundred forty-three thousand, nine hundred twenty-one".