802120809 has 32 divisors (see below), whose sum is σ = 1297416960. Its totient is φ = 430313472.

The previous prime is 802120801. The next prime is 802120829. The reversal of 802120809 is 908021208.

It is not a de Polignac number, because 802120809 - 2³ = 802120801 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (802120801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 151987 + ... + 157175.

It is an arithmetic number, because the mean of its divisors is an integer number (40544280).

Almost surely, 2^802120809 is an apocalyptic number.

It is an amenable number.

802120809 is a deficient number, since it is larger than the sum of its proper divisors (495296151).

802120809 is a wasteful number, since it uses less digits than its factorization.

802120809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5649.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 802120809 is about 28321.7373937405. The cubic root of 802120809 is about 929.1373698374.

The spelling of 802120809 in words is "eight hundred two million, one hundred twenty thousand, eight hundred nine".