40834721 has 2 divisors, whose sum is σ = 40834722. Its totient is φ = 40834720.

The previous prime is 40834709. The next prime is 40834723. The reversal of 40834721 is 12743804.

40834721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40704400 + 130321 = 6380^2 + 361^2 .

It is a cyclic number.

It is not a de Polignac number, because 40834721 - 2¹⁰ = 40833697 is a prime.

It is a Sophie Germain prime.

Together with 40834723, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (40834723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20417360 + 20417361.

It is an arithmetic number, because the mean of its divisors is an integer number (20417361).

Almost surely, 2^40834721 is an apocalyptic number.

It is an amenable number.

40834721 is a deficient number, since it is larger than the sum of its proper divisors (1).

40834721 is an equidigital number, since it uses as much as digits as its factorization.

40834721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 40834721 is about 6390.2050827810. The cubic root of 40834721 is about 344.3577521409.

The spelling of 40834721 in words is "forty million, eight hundred thirty-four thousand, seven hundred twenty-one".