499591638 has 80 divisors (see below), whose sum is σ = 1377831840. Its totient is φ = 131756544.

The previous prime is 499591627. The next prime is 499591639. The reversal of 499591638 is 836195994.

499591638 is a `hidden beast` number, since 49 + 9 + 591 + 6 + 3 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (499591639) 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 39 ways as a sum of consecutive naturals, for example, 2203 + ... + 31686.

It is an arithmetic number, because the mean of its divisors is an integer number (17222898).

Almost surely, 2^499591638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 499591638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (688915920).

499591638 is an abundant number, since it is smaller than the sum of its proper divisors (878240202).

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

499591638 is a wasteful number, since it uses less digits than its factorization.

499591638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33923 (or 33914 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 499591638 is about 22351.5466578937. The cubic root of 499591638 is about 793.4843890425.

The spelling of 499591638 in words is "four hundred ninety-nine million, five hundred ninety-one thousand, six hundred thirty-eight".