138558818 has 8 divisors (see below), whose sum is σ = 210685548. Its totient is φ = 68330304.

The previous prime is 138558799. The next prime is 138558851. The reversal of 138558818 is 818855831.

It can be written as a sum of positive squares in 2 ways, for example, as 119749249 + 18809569 = 10943^2 + 4337^2 .

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

It is a Curzon number.

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, 474371 + ... + 474662.

Almost surely, 2^138558818 is an apocalyptic number.

138558818 is a deficient number, since it is larger than the sum of its proper divisors (72126730).

138558818 is an equidigital number, since it uses as much as digits as its factorization.

138558818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949108.

The product of its digits is 307200, while the sum is 47.

The square root of 138558818 is about 11771.1009680488. The cubic root of 138558818 is about 517.4615161157.

The spelling of 138558818 in words is "one hundred thirty-eight million, five hundred fifty-eight thousand, eight hundred eighteen".