138033809 has 8 divisors (see below), whose sum is σ = 138937728. Its totient is φ = 137133360.

The previous prime is 138033799. The next prime is 138033859. The reversal of 138033809 is 908330831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138033809 - 2¹² = 138029713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138033859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151064 + ... + 151974.

It is an arithmetic number, because the mean of its divisors is an integer number (17367216).

Almost surely, 2^138033809 is an apocalyptic number.

It is an amenable number.

138033809 is a deficient number, since it is larger than the sum of its proper divisors (903919).

138033809 is an equidigital number, since it uses as much as digits as its factorization.

138033809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 138033809 is about 11748.7790429474. The cubic root of 138033809 is about 516.8071230112.

The spelling of 138033809 in words is "one hundred thirty-eight million, thirty-three thousand, eight hundred nine".