138778118 has 4 divisors (see below), whose sum is σ = 208167180. Its totient is φ = 69389058.

The previous prime is 138778093. The next prime is 138778177. The reversal of 138778118 is 811877831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 811877831 = 14759 ⋅55009.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34694528 + ... + 34694531.

It is an arithmetic number, because the mean of its divisors is an integer number (52041795).

Almost surely, 2^138778118 is an apocalyptic number.

138778118 is a deficient number, since it is larger than the sum of its proper divisors (69389062).

138778118 is an equidigital number, since it uses as much as digits as its factorization.

138778118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69389061.

The product of its digits is 75264, while the sum is 44.

The square root of 138778118 is about 11780.4124715563. The cubic root of 138778118 is about 517.7343713455.

The spelling of 138778118 in words is "one hundred thirty-eight million, seven hundred seventy-eight thousand, one hundred eighteen".