138158008 has 8 divisors (see below), whose sum is σ = 259046280. Its totient is φ = 69079000.

The previous prime is 138158003. The next prime is 138158017. The reversal of 138158008 is 800851831.

138158008 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138158003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8634868 + ... + 8634883.

It is an arithmetic number, because the mean of its divisors is an integer number (32380785).

Almost surely, 2^138158008 is an apocalyptic number.

It is an amenable number.

138158008 is a deficient number, since it is larger than the sum of its proper divisors (120888272).

138158008 is a wasteful number, since it uses less digits than its factorization.

138158008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17269757 (or 17269753 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 34.

The square root of 138158008 is about 11754.0634675843. The cubic root of 138158008 is about 516.9620794593.

The spelling of 138158008 in words is "one hundred thirty-eight million, one hundred fifty-eight thousand, eight".