396278321 has 2 divisors, whose sum is σ = 396278322. Its totient is φ = 396278320.

The previous prime is 396278303. The next prime is 396278327. The reversal of 396278321 is 123872693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202066225 + 194212096 = 14215^2 + 13936^2 .

It is a cyclic number.

It is not a de Polignac number, because 396278321 - 2¹⁴ = 396261937 is a prime.

It is not a weakly prime, because it can be changed into another prime (396278327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198139160 + 198139161.

It is an arithmetic number, because the mean of its divisors is an integer number (198139161).

Almost surely, 2^396278321 is an apocalyptic number.

It is an amenable number.

396278321 is a deficient number, since it is larger than the sum of its proper divisors (1).

396278321 is an equidigital number, since it uses as much as digits as its factorization.

396278321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 396278321 is about 19906.7405920708. The cubic root of 396278321 is about 734.5140453204.

The spelling of 396278321 in words is "three hundred ninety-six million, two hundred seventy-eight thousand, three hundred twenty-one".