398191094784 has 264 divisors, whose sum is σ = 1319857913088. Its totient is φ = 113263534080.

The previous prime is 398191094783. The next prime is 398191094789. The reversal of 398191094784 is 487490191893.

398191094784 is a `hidden beast` number, since 398 + 1 + 91 + 0 + 94 + 78 + 4 = 666.

It is a super-2 number, since 2×398191094784² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (398191094783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14630629 + ... + 14657819.

It is an arithmetic number, because the mean of its divisors is an integer number (4999461792).

Almost surely, 2^398191094784 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 398191094784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (659928956544).

398191094784 is an abundant number, since it is smaller than the sum of its proper divisors (921666818304).

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

398191094784 is a wasteful number, since it uses less digits than its factorization.

398191094784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27451 (or 27430 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 63.

The spelling of 398191094784 in words is "three hundred ninety-eight billion, one hundred ninety-one million, ninety-four thousand, seven hundred eighty-four".