8369721 has 24 divisors (see below), whose sum is σ = 12629760. Its totient is φ = 5335200.

The previous prime is 8369701. The next prime is 8369731. The reversal of 8369721 is 1279638.

It is not a de Polignac number, because 8369721 - 2⁶ = 8369657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8369701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36435 + ... + 36663.

It is an arithmetic number, because the mean of its divisors is an integer number (526240).

Almost surely, 2^8369721 is an apocalyptic number.

It is an amenable number.

8369721 is a deficient number, since it is larger than the sum of its proper divisors (4260039).

8369721 is a wasteful number, since it uses less digits than its factorization.

8369721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397 (or 394 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 8369721 is about 2893.0470096423. The cubic root of 8369721 is about 203.0347275717.

The spelling of 8369721 in words is "eight million, three hundred sixty-nine thousand, seven hundred twenty-one".