298117638 has 256 divisors, whose sum is σ = 894566400. Its totient is φ = 71383680.

The previous prime is 298117637. The next prime is 298117691. The reversal of 298117638 is 836711892.

298117638 is a `hidden beast` number, since 2 + 9 + 8 + 1 + 1 + 7 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 298117593 and 298117602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (298117637) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2894295 + ... + 2894397.

It is an arithmetic number, because the mean of its divisors is an integer number (3494400).

Almost surely, 2^298117638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 298117638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (447283200).

298117638 is an abundant number, since it is smaller than the sum of its proper divisors (596448762).

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

298117638 is a wasteful number, since it uses less digits than its factorization.

298117638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 178 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 298117638 is about 17266.0834586191. The cubic root of 298117638 is about 668.0298835042.

The spelling of 298117638 in words is "two hundred ninety-eight million, one hundred seventeen thousand, six hundred thirty-eight".