499995638 has 4 divisors (see below), whose sum is σ = 749993460. Its totient is φ = 249997818.

The previous prime is 499995631. The next prime is 499995673. The reversal of 499995638 is 836599994.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (499995631) 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 as a sum of consecutive naturals, namely, 124998908 + ... + 124998911.

It is an arithmetic number, because the mean of its divisors is an integer number (187498365).

Almost surely, 2^499995638 is an apocalyptic number.

499995638 is a deficient number, since it is larger than the sum of its proper divisors (249997822).

499995638 is a wasteful number, since it uses less digits than its factorization.

499995638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249997821.

The product of its digits is 18895680, while the sum is 62.

The square root of 499995638 is about 22360.5822375000. The cubic root of 499995638 is about 793.6982178963.

It can be divided in two parts, 4999956 and 38, that added together give a palindrome (4999994).

The spelling of 499995638 in words is "four hundred ninety-nine million, nine hundred ninety-five thousand, six hundred thirty-eight".