398884730789776 has 320 divisors, whose sum is σ = 992946733056000. Its totient is φ = 152013792268800.

The previous prime is 398884730789747. The next prime is 398884730789777. The reversal of 398884730789776 is 677987037488893.

It is a super-2 number, since 2×398884730789776² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (398884730789777) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1344033850 + ... + 1344330598.

It is an arithmetic number, because the mean of its divisors is an integer number (3102958540800).

Almost surely, 2^{398884730789776} 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 398884730789776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (496473366528000).

398884730789776 is an abundant number, since it is smaller than the sum of its proper divisors (594062002266224).

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

398884730789776 is a wasteful number, since it uses less digits than its factorization.

398884730789776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296995 (or 296967 counting only the distinct ones).

The product of its (nonzero) digits is 172064342016, while the sum is 94.

The spelling of 398884730789776 in words is "three hundred ninety-eight trillion, eight hundred eighty-four billion, seven hundred thirty million, seven hundred eighty-nine thousand, seven hundred seventy-six".