409128773 has 2 divisors, whose sum is σ = 409128774. Its totient is φ = 409128772.

The previous prime is 409128757. The next prime is 409128787. The reversal of 409128773 is 377821904.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 232318564 + 176810209 = 15242^2 + 13297^2 .

It is a cyclic number.

It is not a de Polignac number, because 409128773 - 2⁴ = 409128757 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 409128773.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409128673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204564386 + 204564387.

It is an arithmetic number, because the mean of its divisors is an integer number (204564387).

Almost surely, 2^409128773 is an apocalyptic number.

It is an amenable number.

409128773 is a deficient number, since it is larger than the sum of its proper divisors (1).

409128773 is an equidigital number, since it uses as much as digits as its factorization.

409128773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 409128773 is about 20226.9318731240. The cubic root of 409128773 is about 742.3693069596.

The spelling of 409128773 in words is "four hundred nine million, one hundred twenty-eight thousand, seven hundred seventy-three".