138401329 has 8 divisors (see below), whose sum is σ = 155854080. Its totient is φ = 121760400.

The previous prime is 138401317. The next prime is 138401371. The reversal of 138401329 is 923104831.

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 138401329 - 2⁹ = 138400817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138401329.

It is not an unprimeable number, because it can be changed into a prime (138401399) 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, 202594 + ... + 203275.

It is an arithmetic number, because the mean of its divisors is an integer number (19481760).

Almost surely, 2^138401329 is an apocalyptic number.

It is an amenable number.

138401329 is a deficient number, since it is larger than the sum of its proper divisors (17452751).

138401329 is a wasteful number, since it uses less digits than its factorization.

138401329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405911.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 138401329 is about 11764.4094199411. The cubic root of 138401329 is about 517.2653890761.

The spelling of 138401329 in words is "one hundred thirty-eight million, four hundred one thousand, three hundred twenty-nine".