491223852 has 120 divisors (see below), whose sum is σ = 1492888320. Its totient is φ = 137933280.

The previous prime is 491223847. The next prime is 491223893. The reversal of 491223852 is 258322194.

It is a happy number.

It is a super-4 number, since 4×491223852⁴ (a number of 36 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 131977 + ... + 135647.

It is an arithmetic number, because the mean of its divisors is an integer number (12440736).

Almost surely, 2^491223852 is an apocalyptic number.

491223852 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491223852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (746444160).

491223852 is an abundant number, since it is smaller than the sum of its proper divisors (1001664468).

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

491223852 is a wasteful number, since it uses less digits than its factorization.

491223852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3753 (or 3742 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 491223852 is about 22163.5703802433. The cubic root of 491223852 is about 789.0293328597.

The spelling of 491223852 in words is "four hundred ninety-one million, two hundred twenty-three thousand, eight hundred fifty-two".