138315506 has 16 divisors (see below), whose sum is σ = 237962880. Its totient is φ = 59065440.

The previous prime is 138315493. The next prime is 138315517. The reversal of 138315506 is 605513831.

138315506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13646 + ... + 21513.

It is an arithmetic number, because the mean of its divisors is an integer number (14872680).

Almost surely, 2^138315506 is an apocalyptic number.

138315506 is a deficient number, since it is larger than the sum of its proper divisors (99647374).

138315506 is a wasteful number, since it uses less digits than its factorization.

138315506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35449.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 138315506 is about 11760.7612848829. The cubic root of 138315506 is about 517.1584477938.

The spelling of 138315506 in words is "one hundred thirty-eight million, three hundred fifteen thousand, five hundred six".