398985517782 has 24 divisors (see below), whose sum is σ = 909966971160. Its totient is φ = 125995426560.

The previous prime is 398985517781. The next prime is 398985517783. The reversal of 398985517782 is 287715589893.

398985517782 is a `hidden beast` number, since 39 + 8 + 9 + 8 + 5 + 517 + 78 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (398985517781) and next prime (398985517783).

It is a self number, because there is not a number n which added to its sum of digits gives 398985517782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398985517781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 583311819 + ... + 583312502.

It is an arithmetic number, because the mean of its divisors is an integer number (37915290465).

Almost surely, 2^398985517782 is an apocalyptic number.

398985517782 is an abundant number, since it is smaller than the sum of its proper divisors (510981453378).

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

398985517782 is a wasteful number, since it uses less digits than its factorization.

398985517782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166624348 (or 1166624345 counting only the distinct ones).

The product of its digits is 304819200, while the sum is 72.

The spelling of 398985517782 in words is "three hundred ninety-eight billion, nine hundred eighty-five million, five hundred seventeen thousand, seven hundred eighty-two".