2405850721 has 2 divisors, whose sum is σ = 2405850722. Its totient is φ = 2405850720.

The previous prime is 2405850679. The next prime is 2405850743. The reversal of 2405850721 is 1270585042.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2048829696 + 357021025 = 45264^2 + 18895^2 .

It is a cyclic number.

It is not a de Polignac number, because 2405850721 - 2¹¹ = 2405848673 is a prime.

It is not a weakly prime, because it can be changed into another prime (2405850791) 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, 1202925360 + 1202925361.

It is an arithmetic number, because the mean of its divisors is an integer number (1202925361).

Almost surely, 2^2405850721 is an apocalyptic number.

It is an amenable number.

2405850721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2405850721 is an equidigital number, since it uses as much as digits as its factorization.

2405850721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 2405850721 is about 49049.4721786076. The cubic root of 2405850721 is about 1339.9529798976.

The spelling of 2405850721 in words is "two billion, four hundred five million, eight hundred fifty thousand, seven hundred twenty-one".