491807385 has 24 divisors (see below), whose sum is σ = 852985224. Its totient is φ = 262137600.

The previous prime is 491807369. The next prime is 491807443. The reversal of 491807385 is 583708194.

491807385 is a `hidden beast` number, since 491 + 80 + 7 + 3 + 85 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 90326016 + 401481369 = 9504^2 + 20037^2 .

It is not a de Polignac number, because 491807385 - 2⁴ = 491807369 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 491807385.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131035 + ... + 134735.

It is an arithmetic number, because the mean of its divisors is an integer number (35541051).

Almost surely, 2^491807385 is an apocalyptic number.

491807385 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

491807385 is a deficient number, since it is larger than the sum of its proper divisors (361177839).

491807385 is a wasteful number, since it uses less digits than its factorization.

491807385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6665 (or 6662 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 491807385 is about 22176.7307103640. The cubic root of 491807385 is about 789.3416429240.

It can be divided in two parts, 49180 and 7385, that added together give a palindrome (56565).

The spelling of 491807385 in words is "four hundred ninety-one million, eight hundred seven thousand, three hundred eighty-five".