197491388 has 6 divisors (see below), whose sum is σ = 345609936. Its totient is φ = 98745692.

The previous prime is 197491379. The next prime is 197491403. The reversal of 197491388 is 883194791.

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 as a sum of consecutive naturals, namely, 24686420 + ... + 24686427.

It is an arithmetic number, because the mean of its divisors is an integer number (57601656).

Almost surely, 2^197491388 is an apocalyptic number.

It is an amenable number.

197491388 is a deficient number, since it is larger than the sum of its proper divisors (148118548).

197491388 is a wasteful number, since it uses less digits than its factorization.

197491388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49372851 (or 49372849 counting only the distinct ones).

The product of its digits is 435456, while the sum is 50.

The square root of 197491388 is about 14053.1629180053. The cubic root of 197491388 is about 582.3481775668.

The spelling of 197491388 in words is "one hundred ninety-seven million, four hundred ninety-one thousand, three hundred eighty-eight".