138212515 has 16 divisors (see below), whose sum is σ = 192764160. Its totient is φ = 93166560.

The previous prime is 138212509. The next prime is 138212537. The reversal of 138212515 is 515212831.

138212515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138212515 - 2⁷ = 138212387 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31401 + ... + 35530.

It is an arithmetic number, because the mean of its divisors is an integer number (12047760).

Almost surely, 2^138212515 is an apocalyptic number.

138212515 is a deficient number, since it is larger than the sum of its proper divisors (54551645).

138212515 is an equidigital number, since it uses as much as digits as its factorization.

138212515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67002.

The product of its digits is 2400, while the sum is 28.

The square root of 138212515 is about 11756.3818838961. The cubic root of 138212515 is about 517.0300556063.

The spelling of 138212515 in words is "one hundred thirty-eight million, two hundred twelve thousand, five hundred fifteen".