399800163996 has 72 divisors (see below), whose sum is σ = 1032444451584. Its totient is φ = 130388770080.

The previous prime is 399800163991. The next prime is 399800164031. The reversal of 399800163996 is 699361008993.

399800163996 is a `hidden beast` number, since 399 + 80 + 0 + 163 + 9 + 9 + 6 = 666.

It is a super-2 number, since 2×399800163996² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399800163991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5382591 + ... + 5456361.

It is an arithmetic number, because the mean of its divisors is an integer number (14339506272).

Almost surely, 2^399800163996 is an apocalyptic number.

399800163996 is a gapful number since it is divisible by the number (36) 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 399800163996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (516222225792).

399800163996 is an abundant number, since it is smaller than the sum of its proper divisors (632644287588).

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

399800163996 is a wasteful number, since it uses less digits than its factorization.

399800163996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77031 (or 77026 counting only the distinct ones).

The product of its (nonzero) digits is 17006112, while the sum is 63.

The spelling of 399800163996 in words is "three hundred ninety-nine billion, eight hundred million, one hundred sixty-three thousand, nine hundred ninety-six".