491335440 has 240 divisors, whose sum is σ = 1653162048. Its totient is φ = 120646656.

The previous prime is 491335433. The next prime is 491335463. The reversal of 491335440 is 44533194.

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 4591867 + ... + 4591973.

Almost surely, 2^491335440 is an apocalyptic number.

491335440 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 491335440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (826581024).

491335440 is an abundant number, since it is smaller than the sum of its proper divisors (1161826608).

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

491335440 is a wasteful number, since it uses less digits than its factorization.

491335440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 491335440 is about 22166.0876114844. The cubic root of 491335440 is about 789.0890744885.

The spelling of 491335440 in words is "four hundred ninety-one million, three hundred thirty-five thousand, four hundred forty".