8421625 has 16 divisors (see below), whose sum is σ = 10642320. Its totient is φ = 6652800.

The previous prime is 8421619. The next prime is 8421641. The reversal of 8421625 is 5261248.

It can be written as a sum of positive squares in 8 ways, for example, as 3594816 + 4826809 = 1896^2 + 2197^2 .

It is not a de Polignac number, because 8421625 - 2¹⁵ = 8388857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8421593 and 8421602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10747 + ... + 11503.

It is an arithmetic number, because the mean of its divisors is an integer number (665145).

Almost surely, 2^8421625 is an apocalyptic number.

It is an amenable number.

8421625 is a deficient number, since it is larger than the sum of its proper divisors (2220695).

8421625 is an equidigital number, since it uses as much as digits as its factorization.

8421625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861 (or 851 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

The square root of 8421625 is about 2902.0036181921. The cubic root of 8421625 is about 203.4535629241.

The spelling of 8421625 in words is "eight million, four hundred twenty-one thousand, six hundred twenty-five".