197685889 has 4 divisors (see below), whose sum is σ = 198828756. Its totient is φ = 196543024.

The previous prime is 197685883. The next prime is 197685947. The reversal of 197685889 is 988586791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 149035264 + 48650625 = 12208^2 + 6975^2 .

It is a cyclic number.

It is not a de Polignac number, because 197685889 - 2³ = 197685881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197685881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 571174 + ... + 571519.

It is an arithmetic number, because the mean of its divisors is an integer number (49707189).

Almost surely, 2^197685889 is an apocalyptic number.

It is an amenable number.

197685889 is a deficient number, since it is larger than the sum of its proper divisors (1142867).

197685889 is a wasteful number, since it uses less digits than its factorization.

197685889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142866.

The product of its digits is 8709120, while the sum is 61.

The square root of 197685889 is about 14060.0814009023. The cubic root of 197685889 is about 582.5392916204.

The spelling of 197685889 in words is "one hundred ninety-seven million, six hundred eighty-five thousand, eight hundred eighty-nine".