397261 has 4 divisors (see below), whose sum is σ = 398524. Its totient is φ = 396000.

The previous prime is 397259. The next prime is 397283. The reversal of 397261 is 162793.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 162793 = 173 ⋅941.

It can be written as a sum of positive squares in 2 ways, for example, as 324900 + 72361 = 570^2 + 269^2 .

It is a cyclic number.

It is not a de Polignac number, because 397261 - 2¹ = 397259 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271 + ... + 931.

It is an arithmetic number, because the mean of its divisors is an integer number (99631).

2³⁹⁷²⁶¹ is an apocalyptic number.

It is an amenable number.

397261 is a deficient number, since it is larger than the sum of its proper divisors (1263).

397261 is an equidigital number, since it uses as much as digits as its factorization.

397261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262.

The product of its digits is 2268, while the sum is 28.

The square root of 397261 is about 630.2864428179. The cubic root of 397261 is about 73.5120686061.

The spelling of 397261 in words is "three hundred ninety-seven thousand, two hundred sixty-one".