197642865 has 16 divisors (see below), whose sum is σ = 361404288. Its totient is φ = 90350976.

The previous prime is 197642821. The next prime is 197642881. The reversal of 197642865 is 568246791.

It is not a de Polignac number, because 197642865 - 2⁷ = 197642737 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 941052 + ... + 941261.

It is an arithmetic number, because the mean of its divisors is an integer number (22587768).

Almost surely, 2^197642865 is an apocalyptic number.

197642865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

197642865 is a deficient number, since it is larger than the sum of its proper divisors (163761423).

197642865 is a wasteful number, since it uses less digits than its factorization.

197642865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1882328.

The product of its digits is 725760, while the sum is 48.

The square root of 197642865 is about 14058.5513122797. The cubic root of 197642865 is about 582.4970276209.

The spelling of 197642865 in words is "one hundred ninety-seven million, six hundred forty-two thousand, eight hundred sixty-five".