138645008 has 10 divisors (see below), whose sum is σ = 268624734. Its totient is φ = 69322496.

The previous prime is 138645007. The next prime is 138645053. The reversal of 138645008 is 800546831.

It can be written as a sum of positive squares in only one way, i.e., 135303424 + 3341584 = 11632^2 + 1828^2 .

It is not an unprimeable number, because it can be changed into a prime (138645007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4332641 + ... + 4332672.

Almost surely, 2^138645008 is an apocalyptic number.

It is an amenable number.

138645008 is a deficient number, since it is larger than the sum of its proper divisors (129979726).

138645008 is an equidigital number, since it uses as much as digits as its factorization.

138645008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8665321 (or 8665315 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 138645008 is about 11774.7614837839. The cubic root of 138645008 is about 517.5687888830.

The spelling of 138645008 in words is "one hundred thirty-eight million, six hundred forty-five thousand, eight".