398563566 has 8 divisors (see below), whose sum is σ = 797127144. Its totient is φ = 132854520.

The previous prime is 398563531. The next prime is 398563579. The reversal of 398563566 is 665365893.

It is a sphenic number, since it is the product of 3 distinct primes.

398563566 is an admirable number.

It is a super-2 number, since 2×398563566² = 317705832285272712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33213625 + ... + 33213636.

It is an arithmetic number, because the mean of its divisors is an integer number (99640893).

Almost surely, 2^398563566 is an apocalyptic number.

398563566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

398563566 is a wasteful number, since it uses less digits than its factorization.

398563566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66427266.

The product of its digits is 3499200, while the sum is 51.

The square root of 398563566 is about 19964.0568522533. The cubic root of 398563566 is about 735.9232638471.

The spelling of 398563566 in words is "three hundred ninety-eight million, five hundred sixty-three thousand, five hundred sixty-six".