396999195840 has 560 divisors, whose sum is σ = 1532966679552. Its totient is φ = 96942956544.

The previous prime is 396999195839. The next prime is 396999195851. The reversal of 396999195840 is 48591999693.

It is a happy number.

396999195840 is a `hidden beast` number, since 39 + 6 + 9 + 9 + 9 + 1 + 9 + 584 + 0 = 666.

It is a super-2 number, since 2×396999195840² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 42789282 + ... + 42798558.

Almost surely, 2^396999195840 is an apocalyptic number.

396999195840 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 396999195840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (766483339776).

396999195840 is an abundant number, since it is smaller than the sum of its proper divisors (1135967483712).

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

396999195840 is a wasteful number, since it uses less digits than its factorization.

396999195840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9446 (or 9427 counting only the distinct ones).

The product of its (nonzero) digits is 170061120, while the sum is 72.

The spelling of 396999195840 in words is "three hundred ninety-six billion, nine hundred ninety-nine million, one hundred ninety-five thousand, eight hundred forty".