399993970068 has 192 divisors, whose sum is σ = 1299478118400. Its totient is φ = 103366730880.

The previous prime is 399993970063. The next prime is 399993970087. The reversal of 399993970068 is 860079399993.

399993970068 is a `hidden beast` number, since 3 + 99 + 99 + 397 + 0 + 0 + 68 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 399993969978 and 399993970005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399993970063) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1516173 + ... + 1760331.

It is an arithmetic number, because the mean of its divisors is an integer number (6768115200).

Almost surely, 2^399993970068 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399993970068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (649739059200).

399993970068 is an abundant number, since it is smaller than the sum of its proper divisors (899484148332).

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

399993970068 is a wasteful number, since it uses less digits than its factorization.

399993970068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244387 (or 244379 counting only the distinct ones).

The product of its (nonzero) digits is 178564176, while the sum is 72.

The spelling of 399993970068 in words is "three hundred ninety-nine billion, nine hundred ninety-three million, nine hundred seventy thousand, sixty-eight".