197115978 has 16 divisors (see below), whose sum is σ = 395028000. Its totient is φ = 65572656.

The previous prime is 197115973. The next prime is 197116001. The reversal of 197115978 is 879511791.

It is not an unprimeable number, because it can be changed into a prime (197115973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29925 + ... + 35912.

It is an arithmetic number, because the mean of its divisors is an integer number (24689250).

Almost surely, 2^197115978 is an apocalyptic number.

197115978 is an abundant number, since it is smaller than the sum of its proper divisors (197912022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

197115978 is a wasteful number, since it uses less digits than its factorization.

197115978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66341.

The product of its digits is 158760, while the sum is 48.

The square root of 197115978 is about 14039.7997848972. The cubic root of 197115978 is about 581.9789496525.

The spelling of 197115978 in words is "one hundred ninety-seven million, one hundred fifteen thousand, nine hundred seventy-eight".