397052209 has 2 divisors, whose sum is σ = 397052210. Its totient is φ = 397052208.

The previous prime is 397052207. The next prime is 397052213. The reversal of 397052209 is 902250793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 330221584 + 66830625 = 18172^2 + 8175^2 .

It is a cyclic number.

It is not a de Polignac number, because 397052209 - 2¹ = 397052207 is a prime.

Together with 397052207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (397052207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198526104 + 198526105.

It is an arithmetic number, because the mean of its divisors is an integer number (198526105).

Almost surely, 2^397052209 is an apocalyptic number.

It is an amenable number.

397052209 is a deficient number, since it is larger than the sum of its proper divisors (1).

397052209 is an equidigital number, since it uses as much as digits as its factorization.

397052209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 397052209 is about 19926.1689493992. The cubic root of 397052209 is about 734.9918761346.

It can be divided in two parts, 39705 and 2209, that added together give a palindrome (41914).

The spelling of 397052209 in words is "three hundred ninety-seven million, fifty-two thousand, two hundred nine".