499998138 has 16 divisors (see below), whose sum is σ = 1002967680. Its totient is φ = 166170816.

The previous prime is 499998137. The next prime is 499998139. The reversal of 499998138 is 831899994.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (499998137) and next prime (499998139).

It is not an unprimeable number, because it can be changed into a prime (499998133) 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 7 ways as a sum of consecutive naturals, for example, 121618 + ... + 125661.

It is an arithmetic number, because the mean of its divisors is an integer number (62685480).

Almost surely, 2^499998138 is an apocalyptic number.

499998138 is an abundant number, since it is smaller than the sum of its proper divisors (502969542).

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

499998138 is a wasteful number, since it uses less digits than its factorization.

499998138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247621.

The product of its digits is 5038848, while the sum is 60.

The square root of 499998138 is about 22360.6381393734. The cubic root of 499998138 is about 793.6995407360.

The spelling of 499998138 in words is "four hundred ninety-nine million, nine hundred ninety-eight thousand, one hundred thirty-eight".