499993639 has 4 divisors (see below), whose sum is σ = 501571224. Its totient is φ = 498416056.

The previous prime is 499993631. The next prime is 499993709. The reversal of 499993639 is 936399994.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936399994 = 2 ⋅468199997.

It is a cyclic number.

It is not a de Polignac number, because 499993639 - 2³ = 499993631 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 (499993631) 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, 788317 + ... + 788950.

It is an arithmetic number, because the mean of its divisors is an integer number (125392806).

Almost surely, 2^499993639 is an apocalyptic number.

499993639 is a deficient number, since it is larger than the sum of its proper divisors (1577585).

499993639 is a wasteful number, since it uses less digits than its factorization.

499993639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577584.

The product of its digits is 12754584, while the sum is 61.

The square root of 499993639 is about 22360.5375382615. The cubic root of 499993639 is about 793.6971601505.

The spelling of 499993639 in words is "four hundred ninety-nine million, nine hundred ninety-three thousand, six hundred thirty-nine".