138715216 has 10 divisors (see below), whose sum is σ = 268760762. Its totient is φ = 69357600.

The previous prime is 138715201. The next prime is 138715217. The reversal of 138715216 is 612517831.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 135489600 + 3225616 = 11640^2 + 1796^2 .

It is a super-2 number, since 2×138715216² = 38483822299853312, which contains 22 as substring.

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 pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4334835 + ... + 4334866.

Almost surely, 2^138715216 is an apocalyptic number.

138715216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138715216 is a deficient number, since it is larger than the sum of its proper divisors (130045546).

138715216 is an equidigital number, since it uses as much as digits as its factorization.

138715216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8669709 (or 8669703 counting only the distinct ones).

The product of its digits is 10080, while the sum is 34.

The square root of 138715216 is about 11777.7423982697. The cubic root of 138715216 is about 517.6561374724.

The spelling of 138715216 in words is "one hundred thirty-eight million, seven hundred fifteen thousand, two hundred sixteen".