820898709 has 16 divisors (see below), whose sum is σ = 1112693760. Its totient is φ = 538250240.

The previous prime is 820898699. The next prime is 820898731. The reversal of 820898709 is 907898028.

It is a cyclic number.

It is not a de Polignac number, because 820898709 - 2⁷ = 820898581 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820898789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42949 + ... + 59045.

It is an arithmetic number, because the mean of its divisors is an integer number (69543360).

Almost surely, 2^820898709 is an apocalyptic number.

820898709 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

820898709 is a deficient number, since it is larger than the sum of its proper divisors (291795051).

820898709 is a wasteful number, since it uses less digits than its factorization.

820898709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16380.

The product of its (nonzero) digits is 580608, while the sum is 51.

The square root of 820898709 is about 28651.3299691306. The cubic root of 820898709 is about 936.3319816887.

The spelling of 820898709 in words is "eight hundred twenty million, eight hundred ninety-eight thousand, seven hundred nine".