499980639 has 4 divisors (see below), whose sum is σ = 666640856. Its totient is φ = 333320424.

The previous prime is 499980571. The next prime is 499980653. The reversal of 499980639 is 936089994.

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

It is not a de Polignac number, because 499980639 - 2⁷ = 499980511 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 (499960639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83330104 + ... + 83330109.

It is an arithmetic number, because the mean of its divisors is an integer number (166660214).

Almost surely, 2^499980639 is an apocalyptic number.

499980639 is a deficient number, since it is larger than the sum of its proper divisors (166660217).

499980639 is a wasteful number, since it uses less digits than its factorization.

499980639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166660216.

The product of its (nonzero) digits is 3779136, while the sum is 57.

The square root of 499980639 is about 22360.2468456858. The cubic root of 499980639 is about 793.6902812946.

The spelling of 499980639 in words is "four hundred ninety-nine million, nine hundred eighty thousand, six hundred thirty-nine".