396380521 has 4 divisors (see below), whose sum is σ = 396436612. Its totient is φ = 396324432.

The previous prime is 396380507. The next prime is 396380533. The reversal of 396380521 is 125083693.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 135396496 + 260984025 = 11636^2 + 16155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-396380521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (396383521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15606 + ... + 32191.

It is an arithmetic number, because the mean of its divisors is an integer number (99109153).

Almost surely, 2^396380521 is an apocalyptic number.

It is an amenable number.

396380521 is a deficient number, since it is larger than the sum of its proper divisors (56091).

396380521 is an equidigital number, since it uses as much as digits as its factorization.

396380521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56090.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 396380521 is about 19909.3073962908. The cubic root of 396380521 is about 734.5771835065.

The spelling of 396380521 in words is "three hundred ninety-six million, three hundred eighty thousand, five hundred twenty-one".