820039469 has 4 divisors (see below), whose sum is σ = 820096860. Its totient is φ = 819982080.

The previous prime is 820039463. The next prime is 820039477. The reversal of 820039469 is 964930028.

It is a happy number.

820039469 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9954025 + 810085444 = 3155^2 + 28462^2 .

It is a cyclic number.

It is not a de Polignac number, because 820039469 - 2²⁸ = 551604013 is a prime.

It is a super-2 number, since 2×820039469² = 1344929461435603922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820039463) 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, 11597 + ... + 42125.

It is an arithmetic number, because the mean of its divisors is an integer number (205024215).

Almost surely, 2^820039469 is an apocalyptic number.

It is an amenable number.

820039469 is a deficient number, since it is larger than the sum of its proper divisors (57391).

820039469 is a wasteful number, since it uses less digits than its factorization.

820039469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57390.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 820039469 is about 28636.3312768937. The cubic root of 820039469 is about 936.0051793885.

The spelling of 820039469 in words is "eight hundred twenty million, thirty-nine thousand, four hundred sixty-nine".