399609178340 has 12 divisors (see below), whose sum is σ = 839179274556. Its totient is φ = 159843671328.

The previous prime is 399609178303. The next prime is 399609178373. The reversal of 399609178340 is 43871906993.

It can be written as a sum of positive squares in 2 ways, for example, as 204282304576 + 195326873764 = 451976^2 + 441958^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 399609178340.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9990229439 + ... + 9990229478.

It is an arithmetic number, because the mean of its divisors is an integer number (69931606213).

Almost surely, 2^399609178340 is an apocalyptic number.

It is an amenable number.

399609178340 is an abundant number, since it is smaller than the sum of its proper divisors (439570096216).

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

399609178340 is a wasteful number, since it uses less digits than its factorization.

399609178340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19980458926 (or 19980458924 counting only the distinct ones).

The product of its (nonzero) digits is 8817984, while the sum is 59.

The spelling of 399609178340 in words is "three hundred ninety-nine billion, six hundred nine million, one hundred seventy-eight thousand, three hundred forty".