133404857 has 4 divisors (see below), whose sum is σ = 136658676. Its totient is φ = 130151040.

The previous prime is 133404823. The next prime is 133404863. The reversal of 133404857 is 758404331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 758404331 = 809 ⋅937459.

It can be written as a sum of positive squares in 2 ways, for example, as 10106041 + 123298816 = 3179^2 + 11104^2 .

It is a cyclic number.

It is not a de Polignac number, because 133404857 - 2²⁰ = 132356281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133464857) 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 3 ways as a sum of consecutive naturals, for example, 1626848 + ... + 1626929.

It is an arithmetic number, because the mean of its divisors is an integer number (34164669).

Almost surely, 2^133404857 is an apocalyptic number.

It is an amenable number.

133404857 is a deficient number, since it is larger than the sum of its proper divisors (3253819).

133404857 is an equidigital number, since it uses as much as digits as its factorization.

133404857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3253818.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 133404857 is about 11550.1020341813. The cubic root of 133404857 is about 510.9642873672.

The spelling of 133404857 in words is "one hundred thirty-three million, four hundred four thousand, eight hundred fifty-seven".