505091898 has 48 divisors (see below), whose sum is σ = 1134923400. Its totient is φ = 162153600.

The previous prime is 505091857. The next prime is 505091911. The reversal of 505091898 is 898190505.

505091898 is a `hidden beast` number, since 50 + 509 + 1 + 8 + 98 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 406546569 + 98545329 = 20163^2 + 9927^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 264748 + ... + 266648.

Almost surely, 2^505091898 is an apocalyptic number.

505091898 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 505091898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (567461700).

505091898 is an abundant number, since it is smaller than the sum of its proper divisors (629831502).

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

505091898 is a wasteful number, since it uses less digits than its factorization.

505091898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2447 (or 2444 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 45.

The square root of 505091898 is about 22474.2496648943. The cubic root of 505091898 is about 796.3857260786.

The spelling of 505091898 in words is "five hundred five million, ninety-one thousand, eight hundred ninety-eight".