138974197 has 4 divisors (see below), whose sum is σ = 139502880. Its totient is φ = 138445516.

The previous prime is 138974179. The next prime is 138974207. The reversal of 138974197 is 791479831.

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: 791479831 = 7151 ⋅110681.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138974197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138974197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138974107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263947 + ... + 264472.

It is an arithmetic number, because the mean of its divisors is an integer number (34875720).

Almost surely, 2^138974197 is an apocalyptic number.

It is an amenable number.

138974197 is a deficient number, since it is larger than the sum of its proper divisors (528683).

138974197 is an equidigital number, since it uses as much as digits as its factorization.

138974197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528682.

The product of its digits is 381024, while the sum is 49.

The square root of 138974197 is about 11788.7317808151. The cubic root of 138974197 is about 517.9780914791.

The spelling of 138974197 in words is "one hundred thirty-eight million, nine hundred seventy-four thousand, one hundred ninety-seven".