197649418 has 4 divisors (see below), whose sum is σ = 296474130. Its totient is φ = 98824708.

The previous prime is 197649383. The next prime is 197649421. The reversal of 197649418 is 814946791.

197649418 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 188870049 + 8779369 = 13743^2 + 2963^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49412353 + ... + 49412356.

Almost surely, 2^197649418 is an apocalyptic number.

197649418 is a deficient number, since it is larger than the sum of its proper divisors (98824712).

197649418 is an equidigital number, since it uses as much as digits as its factorization.

197649418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98824711.

The product of its digits is 435456, while the sum is 49.

The square root of 197649418 is about 14058.7843713459. The cubic root of 197649418 is about 582.5034652609.

The spelling of 197649418 in words is "one hundred ninety-seven million, six hundred forty-nine thousand, four hundred eighteen".