133942789 has 4 divisors (see below), whose sum is σ = 133976524. Its totient is φ = 133909056.

The previous prime is 133942771. The next prime is 133942801. The reversal of 133942789 is 987249331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 987249331 = 457 ⋅2160283.

It can be written as a sum of positive squares in 2 ways, for example, as 66292164 + 67650625 = 8142^2 + 8225^2 .

It is a cyclic number.

It is not a de Polignac number, because 133942789 - 2¹³ = 133934597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133942189) 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, 9972 + ... + 19165.

It is an arithmetic number, because the mean of its divisors is an integer number (33494131).

Almost surely, 2^133942789 is an apocalyptic number.

It is an amenable number.

133942789 is a deficient number, since it is larger than the sum of its proper divisors (33735).

133942789 is an equidigital number, since it uses as much as digits as its factorization.

133942789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33734.

The product of its digits is 326592, while the sum is 46.

The square root of 133942789 is about 11573.3655001473. The cubic root of 133942789 is about 511.6501579954.

The spelling of 133942789 in words is "one hundred thirty-three million, nine hundred forty-two thousand, seven hundred eighty-nine".