138858106 has 4 divisors (see below), whose sum is σ = 208287162. Its totient is φ = 69429052.

The previous prime is 138858101. The next prime is 138858113. The reversal of 138858106 is 601858831.

138858106 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 86657481 + 52200625 = 9309^2 + 7225^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (138858101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34714525 + ... + 34714528.

Almost surely, 2^138858106 is an apocalyptic number.

138858106 is a deficient number, since it is larger than the sum of its proper divisors (69429056).

138858106 is an equidigital number, since it uses as much as digits as its factorization.

138858106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69429055.

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 138858106 is about 11783.8069400343. The cubic root of 138858106 is about 517.8338216615.

The spelling of 138858106 in words is "one hundred thirty-eight million, eight hundred fifty-eight thousand, one hundred six".