499745639 has 4 divisors (see below), whose sum is σ = 509174856. Its totient is φ = 490316424.

The previous prime is 499745629. The next prime is 499745647. The reversal of 499745639 is 936547994.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-499745639 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 (499745629) 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, 4714529 + ... + 4714634.

It is an arithmetic number, because the mean of its divisors is an integer number (127293714).

Almost surely, 2^499745639 is an apocalyptic number.

499745639 is a deficient number, since it is larger than the sum of its proper divisors (9429217).

499745639 is an equidigital number, since it uses as much as digits as its factorization.

499745639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9429216.

The product of its digits is 7348320, while the sum is 56.

The square root of 499745639 is about 22354.9913665830. The cubic root of 499745639 is about 793.5659121815.

The spelling of 499745639 in words is "four hundred ninety-nine million, seven hundred forty-five thousand, six hundred thirty-nine".