138467618 has 8 divisors (see below), whose sum is σ = 219919212. Its totient is φ = 65161216.

The previous prime is 138467617. The next prime is 138467629. The reversal of 138467618 is 816764831.

It can be written as a sum of positive squares in 2 ways, for example, as 138462289 + 5329 = 11767^2 + 73^2 .

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

It is not an unprimeable number, because it can be changed into a prime (138467617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2036255 + ... + 2036322.

Almost surely, 2^138467618 is an apocalyptic number.

138467618 is a deficient number, since it is larger than the sum of its proper divisors (81451594).

138467618 is a wasteful number, since it uses less digits than its factorization.

138467618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4072596.

The product of its digits is 193536, while the sum is 44.

The square root of 138467618 is about 11767.2264361658. The cubic root of 138467618 is about 517.3479594114.

The spelling of 138467618 in words is "one hundred thirty-eight million, four hundred sixty-seven thousand, six hundred eighteen".