862009 has 2 divisors, whose sum is σ = 862010. Its totient is φ = 862008.

The previous prime is 861997. The next prime is 862013. The reversal of 862009 is 900268.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 435600 + 426409 = 660^2 + 653^2 .

It is a cyclic number.

It is not a de Polignac number, because 862009 - 2⁵ = 861977 is a prime.

It is an Ulam number.

862009 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (862409) 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 as a sum of consecutive naturals, namely, 431004 + 431005.

It is an arithmetic number, because the mean of its divisors is an integer number (431005).

2⁸⁶²⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

862009 is a deficient number, since it is larger than the sum of its proper divisors (1).

862009 is an equidigital number, since it uses as much as digits as its factorization.

862009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 862009 is about 928.4443979044. Note that the first 3 decimals coincide. The cubic root of 862009 is about 95.1708467685.

The spelling of 862009 in words is "eight hundred sixty-two thousand, nine".