396321521 has 2 divisors, whose sum is σ = 396321522. Its totient is φ = 396321520.

The previous prime is 396321509. The next prime is 396321529. The reversal of 396321521 is 125123693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 233478400 + 162843121 = 15280^2 + 12761^2 .

It is an emirp because it is prime and its reverse (125123693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 396321521 - 2²² = 392127217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (396321529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198160760 + 198160761.

It is an arithmetic number, because the mean of its divisors is an integer number (198160761).

Almost surely, 2^396321521 is an apocalyptic number.

It is an amenable number.

396321521 is a deficient number, since it is larger than the sum of its proper divisors (1).

396321521 is an equidigital number, since it uses as much as digits as its factorization.

396321521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 32.

The square root of 396321521 is about 19907.8256221015. The cubic root of 396321521 is about 734.5407351931.

The spelling of 396321521 in words is "three hundred ninety-six million, three hundred twenty-one thousand, five hundred twenty-one".