138673018 has 24 divisors (see below), whose sum is σ = 229369140. Its totient is φ = 62832000.

The previous prime is 138672973. The next prime is 138673021. The reversal of 138673018 is 810376831.

It can be written as a sum of positive squares in 2 ways, for example, as 137757169 + 915849 = 11737^2 + 957^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96328 + ... + 97756.

Almost surely, 2^138673018 is an apocalyptic number.

138673018 is a deficient number, since it is larger than the sum of its proper divisors (90696122).

138673018 is a wasteful number, since it uses less digits than its factorization.

138673018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1854 (or 1843 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 138673018 is about 11775.9508320984. The cubic root of 138673018 is about 517.6036407824.

The spelling of 138673018 in words is "one hundred thirty-eight million, six hundred seventy-three thousand, eighteen".