8420725 has 6 divisors (see below), whose sum is σ = 10441730. Its totient is φ = 6736560.

The previous prime is 8420681. The next prime is 8420749. The reversal of 8420725 is 5270248.

8420725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 178084 + 8242641 = 422^2 + 2871^2 .

It is not a de Polignac number, because 8420725 - 2⁷ = 8420597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8420693 and 8420702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 168390 + ... + 168439.

Almost surely, 2^8420725 is an apocalyptic number.

It is an amenable number.

8420725 is a deficient number, since it is larger than the sum of its proper divisors (2021005).

8420725 is a wasteful number, since it uses less digits than its factorization.

8420725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336839 (or 336834 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 8420725 is about 2901.8485487702. The cubic root of 8420725 is about 203.4463151254.

The spelling of 8420725 in words is "eight million, four hundred twenty thousand, seven hundred twenty-five".