396945 has 12 divisors (see below), whose sum is σ = 688116. Its totient is φ = 211680.

The previous prime is 396943. The next prime is 396947. The reversal of 396945 is 549693.

396945 = 108² + 109² + ... + 134².

It is an interprime number because it is at equal distance from previous prime (396943) and next prime (396947).

It can be written as a sum of positive squares in 2 ways, for example, as 197136 + 199809 = 444^2 + 447^2 .

It is not a de Polignac number, because 396945 - 2¹ = 396943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4366 + ... + 4455.

It is an arithmetic number, because the mean of its divisors is an integer number (57343).

2³⁹⁶⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

396945 is a deficient number, since it is larger than the sum of its proper divisors (291171).

396945 is a wasteful number, since it uses less digits than its factorization.

396945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8832 (or 8829 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 396945 is about 630.0357132735. The cubic root of 396945 is about 73.4925717885.

The spelling of 396945 in words is "three hundred ninety-six thousand, nine hundred forty-five".