396645649 has 16 divisors (see below), whose sum is σ = 443819520. Its totient is φ = 352535040.

The previous prime is 396645647. The next prime is 396645671. The reversal of 396645649 is 946546693.

It is a cyclic number.

It is not a de Polignac number, because 396645649 - 2¹ = 396645647 is a prime.

It is a Duffinian number.

Its product of digits (4199040) is a multiple of the sum of its prime divisors (12960).

It is a junction number, because it is equal to n+sod(n) for n = 396645596 and 396645605.

It is not an unprimeable number, because it can be changed into a prime (396645647) 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 15 ways as a sum of consecutive naturals, for example, 24469 + ... + 37309.

It is an arithmetic number, because the mean of its divisors is an integer number (27738720).

Almost surely, 2^396645649 is an apocalyptic number.

It is an amenable number.

396645649 is a deficient number, since it is larger than the sum of its proper divisors (47173871).

396645649 is a wasteful number, since it uses less digits than its factorization.

396645649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12960.

The product of its digits is 4199040, while the sum is 52.

The square root of 396645649 is about 19915.9646766106. The cubic root of 396645649 is about 734.7409264780.

The spelling of 396645649 in words is "three hundred ninety-six million, six hundred forty-five thousand, six hundred forty-nine".