499997640 has 32 divisors (see below), whose sum is σ = 1499993280. Its totient is φ = 133332672.

The previous prime is 499997629. The next prime is 499997647. The reversal of 499997640 is 46799994.

It is not an unprimeable number, because it can be changed into a prime (499997647) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2083204 + ... + 2083443.

It is an arithmetic number, because the mean of its divisors is an integer number (46874790).

Almost surely, 2^499997640 is an apocalyptic number.

499997640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

499997640 is an abundant number, since it is smaller than the sum of its proper divisors (999995640).

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

499997640 is a wasteful number, since it uses less digits than its factorization.

499997640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166661 (or 4166657 counting only the distinct ones).

The product of its (nonzero) digits is 4408992, while the sum is 57.

The square root of 499997640 is about 22360.6270037314. The cubic root of 499997640 is about 793.6992772266.

The spelling of 499997640 in words is "four hundred ninety-nine million, nine hundred ninety-seven thousand, six hundred forty".