197978970 has 64 divisors (see below), whose sum is σ = 551172096. Its totient is φ = 44573760.

The previous prime is 197978947. The next prime is 197978983. The reversal of 197978970 is 79879791.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 197978970.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7035 + ... + 21105.

It is an arithmetic number, because the mean of its divisors is an integer number (8612064).

Almost surely, 2^197978970 is an apocalyptic number.

197978970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 14070×14071.

It is a practical number, because each smaller number is the sum of distinct divisors of 197978970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275586048).

197978970 is an abundant number, since it is smaller than the sum of its proper divisors (353193126).

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

197978970 is a wasteful number, since it uses less digits than its factorization.

197978970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14155.

The product of its (nonzero) digits is 2000376, while the sum is 57.

The square root of 197978970 is about 14070.4999911162. The cubic root of 197978970 is about 582.8270324321.

The spelling of 197978970 in words is "one hundred ninety-seven million, nine hundred seventy-eight thousand, nine hundred seventy".