999796409 has 2 divisors, whose sum is σ = 999796410. Its totient is φ = 999796408.

The previous prime is 999796379. The next prime is 999796459. The reversal of 999796409 is 904697999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 548871184 + 450925225 = 23428^2 + 21235^2 .

It is a cyclic number.

It is not a de Polignac number, because 999796409 - 2²⁰ = 998747833 is a prime.

It is a super-3 number, since 3×999796409³ (a number of 28 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999796459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499898204 + 499898205.

It is an arithmetic number, because the mean of its divisors is an integer number (499898205).

Almost surely, 2^999796409 is an apocalyptic number.

It is an amenable number.

999796409 is a deficient number, since it is larger than the sum of its proper divisors (1).

999796409 is an equidigital number, since it uses as much as digits as its factorization.

999796409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9920232, while the sum is 62.

The square root of 999796409 is about 31619.5573814688. The cubic root of 999796409 is about 999.9321317273.

The spelling of 999796409 in words is "nine hundred ninety-nine million, seven hundred ninety-six thousand, four hundred nine".