398242656 has 240 divisors, whose sum is σ = 1369944576. Its totient is φ = 111124224.

The previous prime is 398242639. The next prime is 398242661. The reversal of 398242656 is 656242893.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 852535 + ... + 853001.

Almost surely, 2^398242656 is an apocalyptic number.

398242656 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398242656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (684972288).

398242656 is an abundant number, since it is smaller than the sum of its proper divisors (971701920).

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

398242656 is a wasteful number, since it uses less digits than its factorization.

398242656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543 (or 526 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 398242656 is about 19956.0180396792. The cubic root of 398242656 is about 735.7256972461.

The spelling of 398242656 in words is "three hundred ninety-eight million, two hundred forty-two thousand, six hundred fifty-six".