138665546 has 4 divisors (see below), whose sum is σ = 207998322. Its totient is φ = 69332772.

The previous prime is 138665539. The next prime is 138665561. The reversal of 138665546 is 645566831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 100781521 + 37884025 = 10039^2 + 6155^2 .

It is a junction number, because it is equal to n+sod(n) for n = 138665497 and 138665506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34666385 + ... + 34666388.

Almost surely, 2^138665546 is an apocalyptic number.

138665546 is a deficient number, since it is larger than the sum of its proper divisors (69332776).

138665546 is an equidigital number, since it uses as much as digits as its factorization.

138665546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69332775.

The product of its digits is 518400, while the sum is 44.

The square root of 138665546 is about 11775.6335710653. The cubic root of 138665546 is about 517.5943440835.

The spelling of 138665546 in words is "one hundred thirty-eight million, six hundred sixty-five thousand, five hundred forty-six".