138715215 has 12 divisors (see below), whose sum is σ = 222017352. Its totient is φ = 73957120.

The previous prime is 138715201. The next prime is 138715217. The reversal of 138715215 is 512517831.

It is not a de Polignac number, because 138715215 - 2⁹ = 138714703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138715217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44095 + ... + 47135.

It is an arithmetic number, because the mean of its divisors is an integer number (18501446).

Almost surely, 2^138715215 is an apocalyptic number.

138715215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138715215 is a deficient number, since it is larger than the sum of its proper divisors (83302137).

138715215 is an frugal number, since it uses more digits than its factorization.

138715215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6090 (or 3049 counting only the distinct ones).

The product of its digits is 8400, while the sum is 33.

The square root of 138715215 is about 11777.7423558168. The cubic root of 138715215 is about 517.6561362285.

The spelling of 138715215 in words is "one hundred thirty-eight million, seven hundred fifteen thousand, two hundred fifteen".