197719138 has 8 divisors (see below), whose sum is σ = 303812460. Its totient is φ = 96448320.

The previous prime is 197719127. The next prime is 197719139. The reversal of 197719138 is 831917791.

197719138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 147209689 + 50509449 = 12133^2 + 7107^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (197719139) 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, 1205523 + ... + 1205686.

Almost surely, 2^197719138 is an apocalyptic number.

197719138 is a deficient number, since it is larger than the sum of its proper divisors (106093322).

197719138 is a wasteful number, since it uses less digits than its factorization.

197719138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2411252.

The product of its digits is 95256, while the sum is 46.

The square root of 197719138 is about 14061.2637412147. The cubic root of 197719138 is about 582.5719490906.

It can be divided in two parts, 1977 and 19138, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 197719138 in words is "one hundred ninety-seven million, seven hundred nineteen thousand, one hundred thirty-eight".