990429409 has 2 divisors, whose sum is σ = 990429410. Its totient is φ = 990429408.

The previous prime is 990429403. The next prime is 990429413. The reversal of 990429409 is 904924099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 969699600 + 20729809 = 31140^2 + 4553^2 .

It is a cyclic number.

It is not a de Polignac number, because 990429409 - 2⁹ = 990428897 is a prime.

It is not a weakly prime, because it can be changed into another prime (990429403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495214704 + 495214705.

It is an arithmetic number, because the mean of its divisors is an integer number (495214705).

Almost surely, 2^990429409 is an apocalyptic number.

It is an amenable number.

990429409 is a deficient number, since it is larger than the sum of its proper divisors (1).

990429409 is an equidigital number, since it uses as much as digits as its factorization.

990429409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 990429409 is about 31471.0884622696. The cubic root of 990429409 is about 996.7995711824.

The spelling of 990429409 in words is "nine hundred ninety million, four hundred twenty-nine thousand, four hundred nine".