138678158 has 16 divisors (see below), whose sum is σ = 210223104. Its totient is φ = 68607000.

The previous prime is 138678121. The next prime is 138678161. The reversal of 138678158 is 851876831.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 184283 + ... + 185033.

It is an arithmetic number, because the mean of its divisors is an integer number (13138944).

Almost surely, 2^138678158 is an apocalyptic number.

138678158 is a deficient number, since it is larger than the sum of its proper divisors (71544946).

138678158 is a wasteful number, since it uses less digits than its factorization.

138678158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1607.

The product of its digits is 322560, while the sum is 47.

The square root of 138678158 is about 11776.1690714765. The cubic root of 138678158 is about 517.6100358016.

The spelling of 138678158 in words is "one hundred thirty-eight million, six hundred seventy-eight thousand, one hundred fifty-eight".