491553440 has 48 divisors (see below), whose sum is σ = 1327197312. Its totient is φ = 168532224.

The previous prime is 491553431. The next prime is 491553443. The reversal of 491553440 is 44355194.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 491553440.

It is not an unprimeable number, because it can be changed into a prime (491553443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218324 + ... + 220563.

It is an arithmetic number, because the mean of its divisors is an integer number (27649944).

Almost surely, 2^491553440 is an apocalyptic number.

491553440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491553440 is an abundant number, since it is smaller than the sum of its proper divisors (835643872).

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

491553440 is a wasteful number, since it uses less digits than its factorization.

491553440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438909 (or 438901 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 491553440 is about 22171.0044878440. The cubic root of 491553440 is about 789.2057605439.

The spelling of 491553440 in words is "four hundred ninety-one million, five hundred fifty-three thousand, four hundred forty".