505843998 has 64 divisors (see below), whose sum is σ = 1128701952. Its totient is φ = 149850080.

The previous prime is 505843997. The next prime is 505843999. The reversal of 505843998 is 899348505.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (505843997) and next prime (505843999).

It is a self number, because there is not a number n which added to its sum of digits gives 505843998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505843997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 585715 + ... + 586577.

It is an arithmetic number, because the mean of its divisors is an integer number (17635968).

Almost surely, 2^505843998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 505843998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (564350976).

505843998 is an abundant number, since it is smaller than the sum of its proper divisors (622857954).

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

505843998 is a wasteful number, since it uses less digits than its factorization.

505843998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069.

The product of its (nonzero) digits is 1555200, while the sum is 51.

The square root of 505843998 is about 22490.9759236899. The cubic root of 505843998 is about 796.7808123726.

The spelling of 505843998 in words is "five hundred five million, eight hundred forty-three thousand, nine hundred ninety-eight".