197486809 has 27 divisors (see below), whose sum is σ = 228406143. Its totient is φ = 170659632.

The previous prime is 197486801. The next prime is 197486819. The reversal of 197486809 is 908684791.

It is a happy number.

The square root of 197486809 is 14053.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 29214025 + 168272784 = 5405^2 + 12972^2 .

It is not a de Polignac number, because 197486809 - 2³ = 197486801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197486801) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4201824 + ... + 4201870.

Almost surely, 2^197486809 is an apocalyptic number.

197486809 is the 14053-rd square number.

197486809 is the 7027-th centered octagonal number.

It is an amenable number.

197486809 is a deficient number, since it is larger than the sum of its proper divisors (30919334).

197486809 is an equidigital number, since it uses as much as digits as its factorization.

197486809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 52.

The cubic root of 197486809 is about 582.3436767917.

The spelling of 197486809 in words is "one hundred ninety-seven million, four hundred eighty-six thousand, eight hundred nine".