398556522 has 192 divisors, whose sum is σ = 1127153664. Its totient is φ = 98962560.

The previous prime is 398556511. The next prime is 398556523. The reversal of 398556522 is 225655893.

398556522 is a `hidden beast` number, since 3 + 9 + 85 + 565 + 2 + 2 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

Its product of digits (648000) is a multiple of the sum of its prime divisors (270).

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (398556523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2386483 + ... + 2386649.

It is an arithmetic number, because the mean of its divisors is an integer number (5870592).

Almost surely, 2^398556522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398556522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (563576832).

398556522 is an abundant number, since it is smaller than the sum of its proper divisors (728597142).

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

398556522 is a wasteful number, since it uses less digits than its factorization.

398556522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273 (or 270 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The square root of 398556522 is about 19963.8804344246. The cubic root of 398556522 is about 735.9189283831.

The spelling of 398556522 in words is "three hundred ninety-eight million, five hundred fifty-six thousand, five hundred twenty-two".