8344721 has 32 divisors (see below), whose sum is σ = 11162880. Its totient is φ = 6048000.

The previous prime is 8344717. The next prime is 8344733. The reversal of 8344721 is 1274438.

It is not a de Polignac number, because 8344721 - 2² = 8344717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8344121) 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 in 31 ways as a sum of consecutive naturals, for example, 82571 + ... + 82671.

It is an arithmetic number, because the mean of its divisors is an integer number (348840).

Almost surely, 2^8344721 is an apocalyptic number.

It is an amenable number.

8344721 is a deficient number, since it is larger than the sum of its proper divisors (2818159).

8344721 is a wasteful number, since it uses less digits than its factorization.

8344721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185.

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

The square root of 8344721 is about 2888.7230743012. The cubic root of 8344721 is about 202.8323739371.

It can be divided in two parts, 834 and 4721, that added together give a palindrome (5555).

The spelling of 8344721 in words is "eight million, three hundred forty-four thousand, seven hundred twenty-one".