138207506 has 16 divisors (see below), whose sum is σ = 222174144. Its totient is φ = 64311984.

The previous prime is 138207499. The next prime is 138207523. The reversal of 138207506 is 605702831.

It is a happy 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, 38900 + ... + 42303.

It is an arithmetic number, because the mean of its divisors is an integer number (13885884).

Almost surely, 2^138207506 is an apocalyptic number.

138207506 is a deficient number, since it is larger than the sum of its proper divisors (83966638).

138207506 is a wasteful number, since it uses less digits than its factorization.

138207506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81265.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 138207506 is about 11756.1688487364. The cubic root of 138207506 is about 517.0238095853.

The spelling of 138207506 in words is "one hundred thirty-eight million, two hundred seven thousand, five hundred six".