820499707 has 4 divisors (see below), whose sum is σ = 821942280. Its totient is φ = 819057136.

The previous prime is 820499689. The next prime is 820499711. The reversal of 820499707 is 707994028.

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

It is a cyclic number.

It is not a de Polignac number, because 820499707 - 2¹⁵ = 820466939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820499777) 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 3 ways as a sum of consecutive naturals, for example, 720433 + ... + 721570.

It is an arithmetic number, because the mean of its divisors is an integer number (205485570).

Almost surely, 2^820499707 is an apocalyptic number.

820499707 is a deficient number, since it is larger than the sum of its proper divisors (1442573).

820499707 is a wasteful number, since it uses less digits than its factorization.

820499707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1442572.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 820499707 is about 28644.3660603617. The cubic root of 820499707 is about 936.1802541266.

The spelling of 820499707 in words is "eight hundred twenty million, four hundred ninety-nine thousand, seven hundred seven".