396878905 has 4 divisors (see below), whose sum is σ = 476254692. Its totient is φ = 317503120.

The previous prime is 396878903. The next prime is 396878921. The reversal of 396878905 is 509878693.

It is a happy number.

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 228372544 + 168506361 = 15112^2 + 12981^2 .

It is not a de Polignac number, because 396878905 - 2¹ = 396878903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (396878903) 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, 39687886 + ... + 39687895.

It is an arithmetic number, because the mean of its divisors is an integer number (119063673).

Almost surely, 2^396878905 is an apocalyptic number.

It is an amenable number.

396878905 is a deficient number, since it is larger than the sum of its proper divisors (79375787).

396878905 is an equidigital number, since it uses as much as digits as its factorization.

396878905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79375786.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The square root of 396878905 is about 19921.8198214922. The cubic root of 396878905 is about 734.8849249864.

The spelling of 396878905 in words is "three hundred ninety-six million, eight hundred seventy-eight thousand, nine hundred five".