138878162 has 4 divisors (see below), whose sum is σ = 208317246. Its totient is φ = 69439080.

The previous prime is 138878161. The next prime is 138878167. The reversal of 138878162 is 261878831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 261878831 = 263 ⋅995737.

It can be written as a sum of positive squares in only one way, i.e., 81739681 + 57138481 = 9041^2 + 7559^2 .

It is not an unprimeable number, because it can be changed into a prime (138878161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34719539 + ... + 34719542.

Almost surely, 2^138878162 is an apocalyptic number.

138878162 is a deficient number, since it is larger than the sum of its proper divisors (69439084).

138878162 is an equidigital number, since it uses as much as digits as its factorization.

138878162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69439083.

The product of its digits is 129024, while the sum is 44.

The square root of 138878162 is about 11784.6579076357. The cubic root of 138878162 is about 517.8587516073.

The spelling of 138878162 in words is "one hundred thirty-eight million, eight hundred seventy-eight thousand, one hundred sixty-two".