197974021 has 12 divisors (see below), whose sum is σ = 231803616. Its totient is φ = 165541320.

The previous prime is 197974019. The next prime is 197974033. The reversal of 197974021 is 120479791.

It is not a de Polignac number, because 197974021 - 2¹ = 197974019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197974921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 243706 + ... + 244516.

It is an arithmetic number, because the mean of its divisors is an integer number (19316968).

Almost surely, 2^197974021 is an apocalyptic number.

It is an amenable number.

197974021 is a deficient number, since it is larger than the sum of its proper divisors (33829595).

197974021 is an frugal number, since it uses more digits than its factorization.

197974021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672 (or 861 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 197974021 is about 14070.3241256199. The cubic root of 197974021 is about 582.8221759651.

The spelling of 197974021 in words is "one hundred ninety-seven million, nine hundred seventy-four thousand, twenty-one".