133858721 has 4 divisors (see below), whose sum is σ = 134559744. Its totient is φ = 133157700.

The previous prime is 133858709. The next prime is 133858723. The reversal of 133858721 is 127858331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 133858721 - 2²⁶ = 66749857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133858723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350225 + ... + 350606.

It is an arithmetic number, because the mean of its divisors is an integer number (33639936).

Almost surely, 2^133858721 is an apocalyptic number.

It is an amenable number.

133858721 is a deficient number, since it is larger than the sum of its proper divisors (701023).

133858721 is an equidigital number, since it uses as much as digits as its factorization.

133858721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701022.

The product of its digits is 40320, while the sum is 38.

The square root of 133858721 is about 11569.7329701251. The cubic root of 133858721 is about 511.5430913691.

The spelling of 133858721 in words is "one hundred thirty-three million, eight hundred fifty-eight thousand, seven hundred twenty-one".