133185394 has 4 divisors (see below), whose sum is σ = 199778094. Its totient is φ = 66592696.

The previous prime is 133185391. The next prime is 133185407. The reversal of 133185394 is 493581331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 70980625 + 62204769 = 8425^2 + 7887^2 .

It is not an unprimeable number, because it can be changed into a prime (133185391) 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 as a sum of consecutive naturals, namely, 33296347 + ... + 33296350.

Almost surely, 2^133185394 is an apocalyptic number.

133185394 is a deficient number, since it is larger than the sum of its proper divisors (66592700).

133185394 is an equidigital number, since it uses as much as digits as its factorization.

133185394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66592699.

The product of its digits is 38880, while the sum is 37.

The square root of 133185394 is about 11540.5976448362. The cubic root of 133185394 is about 510.6839394938.

It can be divided in two parts, 133185 and 394, that multiplied together give a triangular number (52474890 = T₁₀₂₄₄).

The spelling of 133185394 in words is "one hundred thirty-three million, one hundred eighty-five thousand, three hundred ninety-four".