396635723640 has 384 divisors, whose sum is σ = 1424302850880. Its totient is φ = 95103590400.

The previous prime is 396635723639. The next prime is 396635723641. The reversal of 396635723640 is 46327536693.

It is a happy number.

396635723640 is a `hidden beast` number, since 3 + 9 + 6 + 6 + 3 + 572 + 3 + 64 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (396635723639) and next prime (396635723641).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396635723641) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 169428870 + ... + 169431210.

Almost surely, 2^396635723640 is an apocalyptic number.

396635723640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 396635723640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (712151425440).

396635723640 is an abundant number, since it is smaller than the sum of its proper divisors (1027667127240).

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

396635723640 is a wasteful number, since it uses less digits than its factorization.

396635723640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3295 (or 3288 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 54.

The spelling of 396635723640 in words is "three hundred ninety-six billion, six hundred thirty-five million, seven hundred twenty-three thousand, six hundred forty".