138488629 has 8 divisors (see below), whose sum is σ = 141312600. Its totient is φ = 135672576.

The previous prime is 138488599. The next prime is 138488639. The reversal of 138488629 is 926884831.

It can be written as a sum of positive squares in 4 ways, for example, as 36276529 + 102212100 = 6023^2 + 10110^2 .

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 138488629 - 2²¹ = 136391477 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 (138488639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43897 + ... + 46945.

It is an arithmetic number, because the mean of its divisors is an integer number (17664075).

Almost surely, 2^138488629 is an apocalyptic number.

It is an amenable number.

138488629 is a deficient number, since it is larger than the sum of its proper divisors (2823971).

138488629 is an equidigital number, since it uses as much as digits as its factorization.

138488629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3959.

The product of its digits is 663552, while the sum is 49.

The square root of 138488629 is about 11768.1191785264. The cubic root of 138488629 is about 517.3741254527.

The spelling of 138488629 in words is "one hundred thirty-eight million, four hundred eighty-eight thousand, six hundred twenty-nine".