8235721 has 8 divisors (see below), whose sum is σ = 9336320. Its totient is φ = 7201872.

The previous prime is 8235709. The next prime is 8235727. The reversal of 8235721 is 1275328.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8235721 - 2⁷ = 8235593 is a prime.

It is a Duffinian number.

8235721 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8235721.

It is not an unprimeable number, because it can be changed into a prime (8235727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16425 + ... + 16918.

It is an arithmetic number, because the mean of its divisors is an integer number (1167040).

Almost surely, 2^8235721 is an apocalyptic number.

It is an amenable number.

8235721 is a deficient number, since it is larger than the sum of its proper divisors (1100599).

8235721 is a wasteful number, since it uses less digits than its factorization.

8235721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33375.

The product of its digits is 3360, while the sum is 28.

The square root of 8235721 is about 2869.7945919525. The cubic root of 8235721 is about 201.9453582232.

The spelling of 8235721 in words is "eight million, two hundred thirty-five thousand, seven hundred twenty-one".