209475897 has 24 divisors (see below), whose sum is σ = 291608352. Its totient is φ = 133741440.

The previous prime is 209475883. The next prime is 209475923. The reversal of 209475897 is 798574902.

It is not a de Polignac number, because 209475897 - 2¹⁴ = 209459513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (209475857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 325458 + ... + 326100.

It is an arithmetic number, because the mean of its divisors is an integer number (12150348).

Almost surely, 2^209475897 is an apocalyptic number.

It is an amenable number.

209475897 is a deficient number, since it is larger than the sum of its proper divisors (82132455).

209475897 is a wasteful number, since it uses less digits than its factorization.

209475897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821 (or 790 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 51.

The square root of 209475897 is about 14473.2821778614. The cubic root of 209475897 is about 593.8973028138.

The spelling of 209475897 in words is "two hundred nine million, four hundred seventy-five thousand, eight hundred ninety-seven".