138269906 has 8 divisors (see below), whose sum is σ = 207822000. Its totient is φ = 68995908.

The previous prime is 138269903. The next prime is 138269921. The reversal of 138269906 is 609962831.

138269906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (138269903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68276 + ... + 70271.

It is an arithmetic number, because the mean of its divisors is an integer number (25977750).

Almost surely, 2^138269906 is an apocalyptic number.

138269906 is a deficient number, since it is larger than the sum of its proper divisors (69552094).

138269906 is a wasteful number, since it uses less digits than its factorization.

138269906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139048.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 138269906 is about 11758.8224750610. The cubic root of 138269906 is about 517.1016091020.

It can be divided in two parts, 13826 and 9906, that added together give a palindrome (23732).

The spelling of 138269906 in words is "one hundred thirty-eight million, two hundred sixty-nine thousand, nine hundred six".