138679197 has 4 divisors (see below), whose sum is σ = 184905600. Its totient is φ = 92452796.

The previous prime is 138679181. The next prime is 138679201. The reversal of 138679197 is 791976831.

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: 791976831 = 3 ⋅263992277.

It is a cyclic number.

It is not a de Polignac number, because 138679197 - 2⁴ = 138679181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138679147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23113197 + ... + 23113202.

It is an arithmetic number, because the mean of its divisors is an integer number (46226400).

Almost surely, 2^138679197 is an apocalyptic number.

It is an amenable number.

138679197 is a deficient number, since it is larger than the sum of its proper divisors (46226403).

138679197 is an equidigital number, since it uses as much as digits as its factorization.

138679197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46226402.

The product of its digits is 571536, while the sum is 51.

The square root of 138679197 is about 11776.2131859100. The cubic root of 138679197 is about 517.6113284721.

The spelling of 138679197 in words is "one hundred thirty-eight million, six hundred seventy-nine thousand, one hundred ninety-seven".