396776309 has 4 divisors (see below), whose sum is σ = 397183404. Its totient is φ = 396369216.

The previous prime is 396776299. The next prime is 396776327. The reversal of 396776309 is 903677693.

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 259371025 + 137405284 = 16105^2 + 11722^2 .

It is a cyclic number.

It is not a de Polignac number, because 396776309 - 2⁴ = 396776293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396766309) 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 in 3 ways as a sum of consecutive naturals, for example, 202082 + ... + 204035.

It is an arithmetic number, because the mean of its divisors is an integer number (99295851).

Almost surely, 2^396776309 is an apocalyptic number.

It is an amenable number.

396776309 is a deficient number, since it is larger than the sum of its proper divisors (407095).

396776309 is an equidigital number, since it uses as much as digits as its factorization.

396776309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407094.

The product of its (nonzero) digits is 1285956, while the sum is 50.

The square root of 396776309 is about 19919.2446894956. The cubic root of 396776309 is about 734.8215952146.

The spelling of 396776309 in words is "three hundred ninety-six million, seven hundred seventy-six thousand, three hundred nine".