396931647 has 16 divisors (see below), whose sum is σ = 612138240. Its totient is φ = 224084352.

The previous prime is 396931643. The next prime is 396931649. The reversal of 396931647 is 746139693.

It is not a de Polignac number, because 396931647 - 2² = 396931643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 396931596 and 396931605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396931643) 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 15 ways as a sum of consecutive naturals, for example, 112122 + ... + 115607.

It is an arithmetic number, because the mean of its divisors is an integer number (38258640).

Almost surely, 2^396931647 is an apocalyptic number.

396931647 is a deficient number, since it is larger than the sum of its proper divisors (215206593).

396931647 is a wasteful number, since it uses less digits than its factorization.

396931647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227822.

The product of its digits is 734832, while the sum is 48.

The square root of 396931647 is about 19923.1435019678. The cubic root of 396931647 is about 734.9174769676.

The spelling of 396931647 in words is "three hundred ninety-six million, nine hundred thirty-one thousand, six hundred forty-seven".