397221 has 8 divisors (see below), whose sum is σ = 577824. Its totient is φ = 240720.

The previous prime is 397217. The next prime is 397223. The reversal of 397221 is 122793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 397221 - 2² = 397217 is a prime.

397221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 397191 and 397200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5986 + ... + 6051.

It is an arithmetic number, because the mean of its divisors is an integer number (72228).

2³⁹⁷²²¹ is an apocalyptic number.

It is an amenable number.

397221 is a deficient number, since it is larger than the sum of its proper divisors (180603).

397221 is a wasteful number, since it uses less digits than its factorization.

397221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12051.

The product of its digits is 756, while the sum is 24.

The square root of 397221 is about 630.2547104148. The cubic root of 397221 is about 73.5096012262.

It can be divided in two parts, 3972 and 21, that added together give a palindrome (3993).

The spelling of 397221 in words is "three hundred ninety-seven thousand, two hundred twenty-one".