138880198 has 4 divisors (see below), whose sum is σ = 208320300. Its totient is φ = 69440098.

The previous prime is 138880171. The next prime is 138880201. The reversal of 138880198 is 891088831.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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, 34720048 + ... + 34720051.

It is an arithmetic number, because the mean of its divisors is an integer number (52080075).

Almost surely, 2^138880198 is an apocalyptic number.

138880198 is a deficient number, since it is larger than the sum of its proper divisors (69440102).

138880198 is an equidigital number, since it uses as much as digits as its factorization.

138880198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69440101.

The product of its (nonzero) digits is 110592, while the sum is 46.

The square root of 138880198 is about 11784.7442908194. The cubic root of 138880198 is about 517.8612822553.

The spelling of 138880198 in words is "one hundred thirty-eight million, eight hundred eighty thousand, one hundred ninety-eight".