197198538 has 32 divisors (see below), whose sum is σ = 422646336. Its totient is φ = 61118208.

The previous prime is 197198513. The next prime is 197198563. The reversal of 197198538 is 835891791.

It is an interprime number because it is at equal distance from previous prime (197198513) and next prime (197198563).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3181 + ... + 20112.

It is an arithmetic number, because the mean of its divisors is an integer number (13207698).

Almost surely, 2^197198538 is an apocalyptic number.

197198538 is an abundant number, since it is smaller than the sum of its proper divisors (225447798).

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

197198538 is a wasteful number, since it uses less digits than its factorization.

197198538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23398.

The product of its digits is 544320, while the sum is 51.

The square root of 197198538 is about 14042.7396899608. The cubic root of 197198538 is about 582.0601902771.

The spelling of 197198538 in words is "one hundred ninety-seven million, one hundred ninety-eight thousand, five hundred thirty-eight".