8421723 has 12 divisors (see below), whose sum is σ = 12247248. Its totient is φ = 5576400.

The previous prime is 8421713. The next prime is 8421727. The reversal of 8421723 is 3271248.

It is not a de Polignac number, because 8421723 - 2²⁰ = 7373147 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 8⁵ + 4³ + 2⁵ + 1 + 7 + 2²³ + 3⁵ .

It is not an unprimeable number, because it can be changed into a prime (8421727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1740 + ... + 4457.

It is an arithmetic number, because the mean of its divisors is an integer number (1020604).

Almost surely, 2^8421723 is an apocalyptic number.

8421723 is a deficient number, since it is larger than the sum of its proper divisors (3825525).

8421723 is a wasteful number, since it uses less digits than its factorization.

8421723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6354 (or 6351 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 8421723 is about 2902.0205030289. The cubic root of 8421723 is about 203.4543520977.

The spelling of 8421723 in words is "eight million, four hundred twenty-one thousand, seven hundred twenty-three".