138980194 has 4 divisors (see below), whose sum is σ = 208470294. Its totient is φ = 69490096.

The previous prime is 138980189. The next prime is 138980213. The reversal of 138980194 is 491089831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 491089831 = 17839 ⋅27529.

It can be written as a sum of positive squares in only one way, i.e., 100701225 + 38278969 = 10035^2 + 6187^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 138980194.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 34745047 + ... + 34745050.

Almost surely, 2^138980194 is an apocalyptic number.

138980194 is a deficient number, since it is larger than the sum of its proper divisors (69490100).

138980194 is an equidigital number, since it uses as much as digits as its factorization.

138980194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69490099.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 138980194 is about 11788.9861311310. The cubic root of 138980194 is about 517.9855419507.

The spelling of 138980194 in words is "one hundred thirty-eight million, nine hundred eighty thousand, one hundred ninety-four".