491145400 has 96 divisors (see below), whose sum is σ = 1211172480. Its totient is φ = 184896000.

The previous prime is 491145379. The next prime is 491145401. The reversal of 491145400 is 4541194.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491145401) by changing a digit.

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, 228330 + ... + 230470.

It is an arithmetic number, because the mean of its divisors is an integer number (12616380).

Almost surely, 2^491145400 is an apocalyptic number.

491145400 is a gapful number since it is divisible by the number (40) 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 491145400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (605586240).

491145400 is an abundant number, since it is smaller than the sum of its proper divisors (720027080).

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

491145400 is a wasteful number, since it uses less digits than its factorization.

491145400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2225 (or 2216 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 491145400 is about 22161.8004683735. The cubic root of 491145400 is about 788.9873260606.

Adding to 491145400 its reverse (4541194), we get a palindrome (495686594).

The spelling of 491145400 in words is "four hundred ninety-one million, one hundred forty-five thousand, four hundred".