197888478 has 32 divisors (see below), whose sum is σ = 403729920. Its totient is φ = 64644480.

The previous prime is 197888459. The next prime is 197888491. The reversal of 197888478 is 874888791.

Its product of digits (7225344) is a multiple of the sum of its prime divisors (1792).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 151926 + ... + 153222.

It is an arithmetic number, because the mean of its divisors is an integer number (12616560).

Almost surely, 2^197888478 is an apocalyptic number.

197888478 is an abundant number, since it is smaller than the sum of its proper divisors (205841442).

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

197888478 is a wasteful number, since it uses less digits than its factorization.

197888478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1792.

The product of its digits is 7225344, while the sum is 60.

The square root of 197888478 is about 14067.2839595993. The cubic root of 197888478 is about 582.7382195960.

The spelling of 197888478 in words is "one hundred ninety-seven million, eight hundred eighty-eight thousand, four hundred seventy-eight".