398489803694640 has 960 divisors, whose sum is σ = 1690906958064000. Its totient is φ = 85709557334016.

The previous prime is 398489803694617. The next prime is 398489803694747. The reversal of 398489803694640 is 46496308984893.

398489803694640 is a `hidden beast` number, since 3 + 9 + 8 + 4 + 8 + 98 + 0 + 3 + 69 + 464 + 0 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 398489803694640.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 11402019886 + ... + 11402054834.

It is an arithmetic number, because the mean of its divisors is an integer number (1761361414650).

Almost surely, 2^{398489803694640} is an apocalyptic number.

398489803694640 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 398489803694640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (845453479032000).

398489803694640 is an abundant number, since it is smaller than the sum of its proper divisors (1292417154369360).

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

398489803694640 is a wasteful number, since it uses less digits than its factorization.

398489803694640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41339 (or 41320 counting only the distinct ones).

The product of its (nonzero) digits is 7739670528, while the sum is 81.

The spelling of 398489803694640 in words is "three hundred ninety-eight trillion, four hundred eighty-nine billion, eight hundred three million, six hundred ninety-four thousand, six hundred forty".