8420873 has 4 divisors (see below), whose sum is σ = 8495508. Its totient is φ = 8346240.

The previous prime is 8420869. The next prime is 8420887. The reversal of 8420873 is 3780248.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2334784 + 6086089 = 1528^2 + 2467^2 .

It is a cyclic number.

It is not a de Polignac number, because 8420873 - 2² = 8420869 is a prime.

It is a super-2 number, since 2×8420873² = 141822204164258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8420833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37148 + ... + 37373.

It is an arithmetic number, because the mean of its divisors is an integer number (2123877).

Almost surely, 2^8420873 is an apocalyptic number.

It is an amenable number.

8420873 is a deficient number, since it is larger than the sum of its proper divisors (74635).

8420873 is a wasteful number, since it uses less digits than its factorization.

8420873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74634.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 8420873 is about 2901.8740496445. The cubic root of 8420873 is about 203.4475070211.

The spelling of 8420873 in words is "eight million, four hundred twenty thousand, eight hundred seventy-three".