138549508 has 6 divisors (see below), whose sum is σ = 242461646. Its totient is φ = 69274752.

The previous prime is 138549503. The next prime is 138549533. The reversal of 138549508 is 805945831.

It can be written as a sum of positive squares in only one way, i.e., 104816644 + 33732864 = 10238^2 + 5808^2 .

It is not an unprimeable number, because it can be changed into a prime (138549503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17318685 + ... + 17318692.

Almost surely, 2^138549508 is an apocalyptic number.

It is an amenable number.

138549508 is a deficient number, since it is larger than the sum of its proper divisors (103912138).

138549508 is a wasteful number, since it uses less digits than its factorization.

138549508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34637381 (or 34637379 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 43.

The square root of 138549508 is about 11770.7055013708. The cubic root of 138549508 is about 517.4499261530.

The spelling of 138549508 in words is "one hundred thirty-eight million, five hundred forty-nine thousand, five hundred eight".