197972138 has 32 divisors (see below), whose sum is σ = 377287680. Its totient is φ = 75790080.

The previous prime is 197972113. The next prime is 197972147. The reversal of 197972138 is 831279791.

197972138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 197972092 and 197972101.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11903 + ... + 23186.

It is an arithmetic number, because the mean of its divisors is an integer number (11790240).

Almost surely, 2^197972138 is an apocalyptic number.

197972138 is a deficient number, since it is larger than the sum of its proper divisors (179315542).

197972138 is a wasteful number, since it uses less digits than its factorization.

197972138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35142.

The product of its digits is 190512, while the sum is 47.

The square root of 197972138 is about 14070.2572115793. The cubic root of 197972138 is about 582.8203281509.

The spelling of 197972138 in words is "one hundred ninety-seven million, nine hundred seventy-two thousand, one hundred thirty-eight".