820038689 has 4 divisors (see below), whose sum is σ = 863198640. Its totient is φ = 776878740.

The previous prime is 820038671. The next prime is 820038697. The reversal of 820038689 is 986830028.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820038689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820028689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21579947 + ... + 21579984.

It is an arithmetic number, because the mean of its divisors is an integer number (215799660).

Almost surely, 2^820038689 is an apocalyptic number.

It is an amenable number.

820038689 is a deficient number, since it is larger than the sum of its proper divisors (43159951).

820038689 is a wasteful number, since it uses less digits than its factorization.

820038689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43159950.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 820038689 is about 28636.3176578274. The cubic root of 820038689 is about 936.0048826206.

The spelling of 820038689 in words is "eight hundred twenty million, thirty-eight thousand, six hundred eighty-nine".