396421 has 4 divisors (see below), whose sum is σ = 403200. Its totient is φ = 389644.

The previous prime is 396413. The next prime is 396427. The reversal of 396421 is 124693.

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.

It is a cyclic number.

It is not a de Polignac number, because 396421 - 2³ = 396413 is a prime.

It is a Duffinian number.

396421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3301 + ... + 3418.

It is an arithmetic number, because the mean of its divisors is an integer number (100800).

2³⁹⁶⁴²¹ is an apocalyptic number.

It is an amenable number.

396421 is a deficient number, since it is larger than the sum of its proper divisors (6779).

396421 is an equidigital number, since it uses as much as digits as its factorization.

396421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6778.

The product of its digits is 1296, while the sum is 25.

The square root of 396421 is about 629.6197265016. The cubic root of 396421 is about 73.4602188046.

The spelling of 396421 in words is "three hundred ninety-six thousand, four hundred twenty-one".