197947778 has 8 divisors (see below), whose sum is σ = 339339072. Its totient is φ = 84834756.

The previous prime is 197947759. The next prime is 197947793. The reversal of 197947778 is 877749791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7069550 + ... + 7069577.

It is an arithmetic number, because the mean of its divisors is an integer number (42417384).

Almost surely, 2^197947778 is an apocalyptic number.

197947778 is a deficient number, since it is larger than the sum of its proper divisors (141391294).

197947778 is a wasteful number, since it uses less digits than its factorization.

197947778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14139136.

The product of its digits is 6223392, while the sum is 59.

The square root of 197947778 is about 14069.3915291316. The cubic root of 197947778 is about 582.7964222860.

It can be divided in two parts, 19794 and 7778, that added together give a palindrome (27572).

The spelling of 197947778 in words is "one hundred ninety-seven million, nine hundred forty-seven thousand, seven hundred seventy-eight".