138258886 has 4 divisors (see below), whose sum is σ = 207388332. Its totient is φ = 69129442.

The previous prime is 138258881. The next prime is 138258907. The reversal of 138258886 is 688852831.

It is a happy number.

138258886 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 is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138258881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34564720 + ... + 34564723.

It is an arithmetic number, because the mean of its divisors is an integer number (51847083).

Almost surely, 2^138258886 is an apocalyptic number.

138258886 is a deficient number, since it is larger than the sum of its proper divisors (69129446).

138258886 is an equidigital number, since it uses as much as digits as its factorization.

138258886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69129445.

The product of its digits is 737280, while the sum is 49.

The square root of 138258886 is about 11758.3538813900. The cubic root of 138258886 is about 517.0878712099.

The spelling of 138258886 in words is "one hundred thirty-eight million, two hundred fifty-eight thousand, eight hundred eighty-six".