864444409 has 2 divisors, whose sum is σ = 864444410. Its totient is φ = 864444408.

The previous prime is 864444401. The next prime is 864444433. The reversal of 864444409 is 904444468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 673921600 + 190522809 = 25960^2 + 13803^2 .

It is a cyclic number.

It is not a de Polignac number, because 864444409 - 2³ = 864444401 is a prime.

It is not a weakly prime, because it can be changed into another prime (864444401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432222204 + 432222205.

It is an arithmetic number, because the mean of its divisors is an integer number (432222205).

Almost surely, 2^864444409 is an apocalyptic number.

It is an amenable number.

864444409 is a deficient number, since it is larger than the sum of its proper divisors (1).

864444409 is an equidigital number, since it uses as much as digits as its factorization.

864444409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 442368, while the sum is 43.

The square root of 864444409 is about 29401.4354921660. The cubic root of 864444409 is about 952.6039030317.

The spelling of 864444409 in words is "eight hundred sixty-four million, four hundred forty-four thousand, four hundred nine".