138247178 has 8 divisors (see below), whose sum is σ = 207433380. Its totient is φ = 69102720.

The previous prime is 138247177. The next prime is 138247183. The reversal of 138247178 is 871742831.

It can be written as a sum of positive squares in 2 ways, for example, as 122699929 + 15547249 = 11077^2 + 3943^2 .

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

It is a super-2 number, since 2×138247178² = 38224564449927368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138247177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113 + ... + 16628.

Almost surely, 2^138247178 is an apocalyptic number.

138247178 is a deficient number, since it is larger than the sum of its proper divisors (69186202).

138247178 is a wasteful number, since it uses less digits than its factorization.

138247178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20872.

The product of its digits is 75264, while the sum is 41.

The square root of 138247178 is about 11757.8560120457. The cubic root of 138247178 is about 517.0732748348.

The spelling of 138247178 in words is "one hundred thirty-eight million, two hundred forty-seven thousand, one hundred seventy-eight".