396642708618 has 64 divisors (see below), whose sum is σ = 862812733440. Its totient is φ = 120832834752.

The previous prime is 396642708593. The next prime is 396642708689. The reversal of 396642708618 is 816807246693.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4783113 + ... + 4865331.

It is an arithmetic number, because the mean of its divisors is an integer number (13481448960).

Almost surely, 2^396642708618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 396642708618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (431406366720).

396642708618 is an abundant number, since it is smaller than the sum of its proper divisors (466170024822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

396642708618 is a wasteful number, since it uses less digits than its factorization.

396642708618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82851.

The product of its (nonzero) digits is 20901888, while the sum is 60.

The spelling of 396642708618 in words is "three hundred ninety-six billion, six hundred forty-two million, seven hundred eight thousand, six hundred eighteen".