133908394 has 4 divisors (see below), whose sum is σ = 200862594. Its totient is φ = 66954196.

The previous prime is 133908389. The next prime is 133908427. The reversal of 133908394 is 493809331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 493809331 = 71 ⋅6955061.

It can be written as a sum of positive squares in only one way, i.e., 91489225 + 42419169 = 9565^2 + 6513^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33477097 + ... + 33477100.

Almost surely, 2^133908394 is an apocalyptic number.

133908394 is a deficient number, since it is larger than the sum of its proper divisors (66954200).

133908394 is an equidigital number, since it uses as much as digits as its factorization.

133908394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66954199.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 133908394 is about 11571.8794497696. The cubic root of 133908394 is about 511.6063589131.

The spelling of 133908394 in words is "one hundred thirty-three million, nine hundred eight thousand, three hundred ninety-four".