409721047 has 2 divisors, whose sum is σ = 409721048. Its totient is φ = 409721046.

The previous prime is 409721033. The next prime is 409721089. The reversal of 409721047 is 740127904.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 409721047 - 2¹¹ = 409718999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409721027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204860523 + 204860524.

It is an arithmetic number, because the mean of its divisors is an integer number (204860524).

Almost surely, 2^409721047 is an apocalyptic number.

409721047 is a deficient number, since it is larger than the sum of its proper divisors (1).

409721047 is an equidigital number, since it uses as much as digits as its factorization.

409721047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 409721047 is about 20241.5673059178. The cubic root of 409721047 is about 742.7273637772.

The spelling of 409721047 in words is "four hundred nine million, seven hundred twenty-one thousand, forty-seven".