399865364687104 has 144 divisors (see below), whose sum is σ = 810378169688304. Its totient is φ = 196898324480000.

The previous prime is 399865364687077. The next prime is 399865364687141. The reversal of 399865364687104 is 401786463568993.

It can be written as a sum of positive squares in 8 ways, for example, as 103560093896704 + 296305270790400 = 10176448^2 + 17213520^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3659939742 + ... + 3660048994.

It is an arithmetic number, because the mean of its divisors is an integer number (5627626178391).

Almost surely, 2^{399865364687104} 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 399865364687104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (405189084844152).

399865364687104 is an abundant number, since it is smaller than the sum of its proper divisors (410512805001200).

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

399865364687104 is a wasteful number, since it uses less digits than its factorization.

399865364687104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110124 (or 110110 counting only the distinct ones).

The product of its (nonzero) digits is 5643509760, while the sum is 79.

The spelling of 399865364687104 in words is "three hundred ninety-nine trillion, eight hundred sixty-five billion, three hundred sixty-four million, six hundred eighty-seven thousand, one hundred four".