197656404 has 72 divisors (see below), whose sum is σ = 510247584. Its totient is φ = 59505600.

The previous prime is 197656379. The next prime is 197656421. The reversal of 197656404 is 404656791.

197656404 is nontrivially palindromic in base 5.

It is a super-2 number, since 2×197656404² = 78136108084422432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 285699 + ... + 286389.

It is an arithmetic number, because the mean of its divisors is an integer number (7086772).

Almost surely, 2^197656404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 197656404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255123792).

197656404 is an abundant number, since it is smaller than the sum of its proper divisors (312591180).

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

197656404 is a wasteful number, since it uses less digits than its factorization.

197656404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917 (or 904 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 197656404 is about 14059.0328259095. The cubic root of 197656404 is about 582.5103281216.

The spelling of 197656404 in words is "one hundred ninety-seven million, six hundred fifty-six thousand, four hundred four".