806389961 has 8 divisors (see below), whose sum is σ = 868930440. Its totient is φ = 743922432.

The previous prime is 806389943. The next prime is 806389999. The reversal of 806389961 is 169983608.

It can be written as a sum of positive squares in 4 ways, for example, as 35772361 + 770617600 = 5981^2 + 27760^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 806389961 - 2²² = 802195657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (806389061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5921 + ... + 40593.

It is an arithmetic number, because the mean of its divisors is an integer number (108616305).

Almost surely, 2^806389961 is an apocalyptic number.

It is an amenable number.

806389961 is a deficient number, since it is larger than the sum of its proper divisors (62540479).

806389961 is a wasteful number, since it uses less digits than its factorization.

806389961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36475.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 806389961 is about 28397.0061978371. The cubic root of 806389961 is about 930.7828460610.

The spelling of 806389961 in words is "eight hundred six million, three hundred eighty-nine thousand, nine hundred sixty-one".