499997815 has 4 divisors (see below), whose sum is σ = 599997384. Its totient is φ = 399998248.

The previous prime is 499997809. The next prime is 499997819. The reversal of 499997815 is 518799994.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 499997815 - 2⁵ = 499997783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (499997819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49999777 + ... + 49999786.

It is an arithmetic number, because the mean of its divisors is an integer number (149999346).

Almost surely, 2^499997815 is an apocalyptic number.

499997815 is a deficient number, since it is larger than the sum of its proper divisors (99999569).

499997815 is an equidigital number, since it uses as much as digits as its factorization.

499997815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99999568.

The product of its digits is 7348320, while the sum is 61.

The square root of 499997815 is about 22360.6309168592. The cubic root of 499997815 is about 793.6993698253.

The spelling of 499997815 in words is "four hundred ninety-nine million, nine hundred ninety-seven thousand, eight hundred fifteen".