197644818 has 16 divisors (see below), whose sum is σ = 451759680. Its totient is φ = 56469936.

The previous prime is 197644793. The next prime is 197644877. The reversal of 197644818 is 818446791.

197644818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2352873 + ... + 2352956.

It is an arithmetic number, because the mean of its divisors is an integer number (28234980).

Almost surely, 2^197644818 is an apocalyptic number.

197644818 is an abundant number, since it is smaller than the sum of its proper divisors (254114862).

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

197644818 is a wasteful number, since it uses less digits than its factorization.

197644818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4705841.

The product of its digits is 387072, while the sum is 48.

The square root of 197644818 is about 14058.6207716120. The cubic root of 197644818 is about 582.4989462549.

The spelling of 197644818 in words is "one hundred ninety-seven million, six hundred forty-four thousand, eight hundred eighteen".