138427818 has 8 divisors (see below), whose sum is σ = 276855648. Its totient is φ = 46142604.

The previous prime is 138427813. The next prime is 138427837. The reversal of 138427818 is 818724831.

138427818 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

138427818 is an admirable number.

It is a super-2 number, since 2×138427818² = 38324521592482248, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138427818.

It is not an unprimeable number, because it can be changed into a prime (138427813) by changing a digit.

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, 11535646 + ... + 11535657.

It is an arithmetic number, because the mean of its divisors is an integer number (34606956).

Almost surely, 2^138427818 is an apocalyptic number.

138427818 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138427818 is a wasteful number, since it uses less digits than its factorization.

138427818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23071308.

The product of its digits is 86016, while the sum is 42.

The square root of 138427818 is about 11765.5351769480. The cubic root of 138427818 is about 517.2983872391.

The spelling of 138427818 in words is "one hundred thirty-eight million, four hundred twenty-seven thousand, eight hundred eighteen".