396221 has 12 divisors (see below), whose sum is σ = 477792. Its totient is φ = 321816.

The previous prime is 396217. The next prime is 396239. The reversal of 396221 is 122693.

396221 = T₁₇₄ + T₁₇₅ + ... + T₁₉₆.

It is not a de Polignac number, because 396221 - 2² = 396217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (392221) 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 11 ways as a sum of consecutive naturals, for example, 3650 + ... + 3756.

It is an arithmetic number, because the mean of its divisors is an integer number (39816).

2³⁹⁶²²¹ is an apocalyptic number.

It is an amenable number.

396221 is a deficient number, since it is larger than the sum of its proper divisors (81571).

396221 is a wasteful number, since it uses less digits than its factorization.

396221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 137 counting only the distinct ones).

The product of its digits is 648, while the sum is 23.

The square root of 396221 is about 629.4608804366. The cubic root of 396221 is about 73.4478628201.

The spelling of 396221 in words is "three hundred ninety-six thousand, two hundred twenty-one".