397042209 has 16 divisors (see below), whose sum is σ = 589127040. Its totient is φ = 264282480.

The previous prime is 397042199. The next prime is 397042223. The reversal of 397042209 is 902240793.

It is not a de Polignac number, because 397042209 - 2¹² = 397038113 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (397042309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6724 + ... + 28970.

It is an arithmetic number, because the mean of its divisors is an integer number (36820440).

Almost surely, 2^397042209 is an apocalyptic number.

It is an amenable number.

397042209 is a deficient number, since it is larger than the sum of its proper divisors (192084831).

397042209 is a wasteful number, since it uses less digits than its factorization.

397042209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22917 (or 22911 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 397042209 is about 19925.9180215116. The cubic root of 397042209 is about 734.9857056779.

The spelling of 397042209 in words is "three hundred ninety-seven million, forty-two thousand, two hundred nine".