138660626 has 8 divisors (see below), whose sum is σ = 223990284. Its totient is φ = 63997200.

The previous prime is 138660607. The next prime is 138660631. The reversal of 138660626 is 626066831.

It can be written as a sum of positive squares in 2 ways, for example, as 126585001 + 12075625 = 11251^2 + 3475^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 138660626.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2666525 + ... + 2666576.

Almost surely, 2^138660626 is an apocalyptic number.

138660626 is a deficient number, since it is larger than the sum of its proper divisors (85329658).

138660626 is a wasteful number, since it uses less digits than its factorization.

138660626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5333116.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 138660626 is about 11775.4246632552. The cubic root of 138660626 is about 517.5882224132.

The spelling of 138660626 in words is "one hundred thirty-eight million, six hundred sixty thousand, six hundred twenty-six".