499980638 has 4 divisors (see below), whose sum is σ = 749970960. Its totient is φ = 249990318.

The previous prime is 499980571. The next prime is 499980653. The reversal of 499980638 is 836089994.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 836089994 = 2 ⋅418044997.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 124995158 + ... + 124995161.

It is an arithmetic number, because the mean of its divisors is an integer number (187492740).

Almost surely, 2^499980638 is an apocalyptic number.

499980638 is a deficient number, since it is larger than the sum of its proper divisors (249990322).

499980638 is a wasteful number, since it uses less digits than its factorization.

499980638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249990321.

The product of its (nonzero) digits is 3359232, while the sum is 56.

The square root of 499980638 is about 22360.2468233246. The cubic root of 499980638 is about 793.6902807655.

The spelling of 499980638 in words is "four hundred ninety-nine million, nine hundred eighty thousand, six hundred thirty-eight".