197760978 has 12 divisors (see below), whose sum is σ = 428482158. Its totient is φ = 65920320.

The previous prime is 197760977. The next prime is 197761001. The reversal of 197760978 is 879067791.

It can be written as a sum of positive squares in only one way, i.e., 117353889 + 80407089 = 10833^2 + 8967^2 .

It is not an unprimeable number, because it can be changed into a prime (197760977) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5493343 + ... + 5493378.

Almost surely, 2^197760978 is an apocalyptic number.

197760978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

197760978 is an abundant number, since it is smaller than the sum of its proper divisors (230721180).

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

197760978 is a wasteful number, since it uses less digits than its factorization.

197760978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10986729 (or 10986726 counting only the distinct ones).

The product of its (nonzero) digits is 1333584, while the sum is 54.

The square root of 197760978 is about 14062.7514377521. The cubic root of 197760978 is about 582.6130395173.

The spelling of 197760978 in words is "one hundred ninety-seven million, seven hundred sixty thousand, nine hundred seventy-eight".