491810843400 has 192 divisors, whose sum is σ = 1578536467200. Its totient is φ = 126518784000.

The previous prime is 491810843399. The next prime is 491810843479. The reversal of 491810843400 is 4348018194.

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 47 ways as a sum of consecutive naturals, for example, 21407920 + ... + 21430880.

It is an arithmetic number, because the mean of its divisors is an integer number (8221544100).

Almost surely, 2^491810843400 is an apocalyptic number.

491810843400 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 491810843400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (789268233600).

491810843400 is an abundant number, since it is smaller than the sum of its proper divisors (1086725623800).

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

491810843400 is a wasteful number, since it uses less digits than its factorization.

491810843400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24240 (or 24231 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

The spelling of 491810843400 in words is "four hundred ninety-one billion, eight hundred ten million, eight hundred forty-three thousand, four hundred".