138807215 has 8 divisors (see below), whose sum is σ = 170112960. Its totient is φ = 108682912.

The previous prime is 138807211. The next prime is 138807223. The reversal of 138807215 is 512708831.

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 138807215 - 2² = 138807211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138807211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295100 + ... + 295569.

It is an arithmetic number, because the mean of its divisors is an integer number (21264120).

Almost surely, 2^138807215 is an apocalyptic number.

138807215 is a deficient number, since it is larger than the sum of its proper divisors (31305745).

138807215 is an equidigital number, since it uses as much as digits as its factorization.

138807215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590721.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 138807215 is about 11781.6473805661. The cubic root of 138807215 is about 517.7705525161.

The spelling of 138807215 in words is "one hundred thirty-eight million, eight hundred seven thousand, two hundred fifteen".