396921 has 16 divisors (see below), whose sum is σ = 620928. Its totient is φ = 220800.

The previous prime is 396919. The next prime is 396931. The reversal of 396921 is 129693.

It is not a de Polignac number, because 396921 - 2¹ = 396919 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (396931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 631 + ... + 1091.

It is an arithmetic number, because the mean of its divisors is an integer number (38808).

2³⁹⁶⁹²¹ is an apocalyptic number.

It is an amenable number.

396921 is a deficient number, since it is larger than the sum of its proper divisors (224007).

396921 is a wasteful number, since it uses less digits than its factorization.

396921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512.

The product of its digits is 2916, while the sum is 30.

The square root of 396921 is about 630.0166664462. The cubic root of 396921 is about 73.4910905948.

It can be divided in two parts, 39692 and 1, that added together give a palindrome (39693).

The spelling of 396921 in words is "three hundred ninety-six thousand, nine hundred twenty-one".