490391440 has 80 divisors (see below), whose sum is σ = 1421516160. Its totient is φ = 152847360.

The previous prime is 490391423. The next prime is 490391453. The reversal of 490391440 is 44193094.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 490391396 and 490391405.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33645 + ... + 45964.

It is an arithmetic number, because the mean of its divisors is an integer number (17768952).

Almost surely, 2^490391440 is an apocalyptic number.

490391440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

490391440 is an abundant number, since it is smaller than the sum of its proper divisors (931124720).

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

490391440 is a wasteful number, since it uses less digits than its factorization.

490391440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79640 (or 79634 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 490391440 is about 22144.7835844020. The cubic root of 490391440 is about 788.5833930382.

The spelling of 490391440 in words is "four hundred ninety million, three hundred ninety-one thousand, four hundred forty".