138404334 has 8 divisors (see below), whose sum is σ = 276808680. Its totient is φ = 46134776.

The previous prime is 138404333. The next prime is 138404351. The reversal of 138404334 is 433404831.

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

138404334 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138404333) 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, 11533689 + ... + 11533700.

It is an arithmetic number, because the mean of its divisors is an integer number (34601085).

Almost surely, 2^138404334 is an apocalyptic number.

138404334 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138404334 is a wasteful number, since it uses less digits than its factorization.

138404334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23067394.

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 138404334 is about 11764.5371349663. The cubic root of 138404334 is about 517.2691327088.

The spelling of 138404334 in words is "one hundred thirty-eight million, four hundred four thousand, three hundred thirty-four".