397213 has 4 divisors (see below), whose sum is σ = 410940. Its totient is φ = 383488.

The previous prime is 397211. The next prime is 397217. The reversal of 397213 is 312793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312793 = 13 ⋅24061.

It can be written as a sum of positive squares in 2 ways, for example, as 85849 + 311364 = 293^2 + 558^2 .

It is a cyclic number.

It is not a de Polignac number, because 397213 - 2¹ = 397211 is a prime.

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, 6820 + ... + 6877.

It is an arithmetic number, because the mean of its divisors is an integer number (102735).

2³⁹⁷²¹³ is an apocalyptic number.

It is an amenable number.

397213 is a deficient number, since it is larger than the sum of its proper divisors (13727).

397213 is a wasteful number, since it uses less digits than its factorization.

397213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13726.

The product of its digits is 1134, while the sum is 25.

The square root of 397213 is about 630.2483637424. The cubic root of 397213 is about 73.5091077303.

The spelling of 397213 in words is "three hundred ninety-seven thousand, two hundred thirteen".