138616873 has 4 divisors (see below), whose sum is σ = 138653008. Its totient is φ = 138580740.

The previous prime is 138616843. The next prime is 138616879. The reversal of 138616873 is 378616831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 378616831 = 379 ⋅998989.

It is a cyclic number.

It is not a de Polignac number, because 138616873 - 2¹⁷ = 138485801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138616879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11523 + ... + 20248.

It is an arithmetic number, because the mean of its divisors is an integer number (34663252).

Almost surely, 2^138616873 is an apocalyptic number.

It is an amenable number.

138616873 is a deficient number, since it is larger than the sum of its proper divisors (36135).

138616873 is an equidigital number, since it uses as much as digits as its factorization.

138616873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36134.

The product of its digits is 145152, while the sum is 43.

The square root of 138616873 is about 11773.5667068225. The cubic root of 138616873 is about 517.5337767245.

The spelling of 138616873 in words is "one hundred thirty-eight million, six hundred sixteen thousand, eight hundred seventy-three".