397217273 has 4 divisors (see below), whose sum is σ = 406454928. Its totient is φ = 387979620.

The previous prime is 397217269. The next prime is 397217341. The reversal of 397217273 is 372712793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 372712793 = 139 ⋅2681387.

It is a cyclic number.

It is not a de Polignac number, because 397217273 - 2² = 397217269 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 397217273.

It is not an unprimeable number, because it can be changed into a prime (397217203) 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, 4618763 + ... + 4618848.

It is an arithmetic number, because the mean of its divisors is an integer number (101613732).

Almost surely, 2^397217273 is an apocalyptic number.

It is an amenable number.

397217273 is a deficient number, since it is larger than the sum of its proper divisors (9237655).

397217273 is an equidigital number, since it uses as much as digits as its factorization.

397217273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9237654.

The product of its digits is 111132, while the sum is 41.

The square root of 397217273 is about 19930.3104090227. The cubic root of 397217273 is about 735.0937131964.

The spelling of 397217273 in words is "three hundred ninety-seven million, two hundred seventeen thousand, two hundred seventy-three".