197721864 has 32 divisors (see below), whose sum is σ = 549228000. Its totient is φ = 65907216.

The previous prime is 197721859. The next prime is 197721877. The reversal of 197721864 is 468127791.

It is a happy number.

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, 457474 + ... + 457905.

It is an arithmetic number, because the mean of its divisors is an integer number (17163375).

Almost surely, 2^197721864 is an apocalyptic number.

It is an amenable number.

197721864 is an abundant number, since it is smaller than the sum of its proper divisors (351506136).

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

197721864 is a wasteful number, since it uses less digits than its factorization.

197721864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915394 (or 915384 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 197721864 is about 14061.3606738466. The cubic root of 197721864 is about 582.5746264302.

The spelling of 197721864 in words is "one hundred ninety-seven million, seven hundred twenty-one thousand, eight hundred sixty-four".