138870329 has 8 divisors (see below), whose sum is σ = 149668680. Its totient is φ = 128088576.

The previous prime is 138870323. The next prime is 138870337. The reversal of 138870329 is 923078831.

It can be written as a sum of positive squares in 4 ways, for example, as 6620329 + 132250000 = 2573^2 + 11500^2 .

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 138870329 - 2⁸ = 138870073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138870323) 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, 17417 + ... + 24105.

It is an arithmetic number, because the mean of its divisors is an integer number (18708585).

Almost surely, 2^138870329 is an apocalyptic number.

It is an amenable number.

138870329 is a deficient number, since it is larger than the sum of its proper divisors (10798351).

138870329 is a wasteful number, since it uses less digits than its factorization.

138870329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8299.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 138870329 is about 11784.3255640703. The cubic root of 138870329 is about 517.8490153420.

It can be divided in two parts, 1388 and 70329, that added together give a palindrome (71717).

The spelling of 138870329 in words is "one hundred thirty-eight million, eight hundred seventy thousand, three hundred twenty-nine".