398978283672 has 96 divisors (see below), whose sum is σ = 1112053082400. Its totient is φ = 129132237312.

The previous prime is 398978283667. The next prime is 398978283701. The reversal of 398978283672 is 276382879893.

398978283672 is a `hidden beast` number, since 398 + 97 + 8 + 2 + 83 + 6 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 398978283672.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1143604 + ... + 1451132.

It is an arithmetic number, because the mean of its divisors is an integer number (11583886275).

Almost surely, 2^398978283672 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 398978283672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (556026541200).

398978283672 is an abundant number, since it is smaller than the sum of its proper divisors (713074798728).

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

398978283672 is a wasteful number, since it uses less digits than its factorization.

398978283672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308065 (or 308058 counting only the distinct ones).

The product of its digits is 438939648, while the sum is 72.

The spelling of 398978283672 in words is "three hundred ninety-eight billion, nine hundred seventy-eight million, two hundred eighty-three thousand, six hundred seventy-two".