138351215 has 8 divisors (see below), whose sum is σ = 166131600. Its totient is φ = 110607552.

The previous prime is 138351173. The next prime is 138351259. The reversal of 138351215 is 512153831.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 138351215 - 2⁸ = 138350959 is a prime.

It is a congruent number.

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, 65 + ... + 16634.

It is an arithmetic number, because the mean of its divisors is an integer number (20766450).

Almost surely, 2^138351215 is an apocalyptic number.

138351215 is a deficient number, since it is larger than the sum of its proper divisors (27780385).

138351215 is a wasteful number, since it uses less digits than its factorization.

138351215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18361.

The product of its digits is 3600, while the sum is 29.

The square root of 138351215 is about 11762.2793284295. The cubic root of 138351215 is about 517.2029490035.

The spelling of 138351215 in words is "one hundred thirty-eight million, three hundred fifty-one thousand, two hundred fifteen".