8425409 has 4 divisors (see below), whose sum is σ = 8432580. Its totient is φ = 8418240.

The previous prime is 8425331. The next prime is 8425423. The reversal of 8425409 is 9045248.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6235009 + 2190400 = 2497^2 + 1480^2 .

It is a cyclic number.

It is not a de Polignac number, because 8425409 - 2¹⁶ = 8359873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8425309) 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, 1364 + ... + 4325.

It is an arithmetic number, because the mean of its divisors is an integer number (2108145).

Almost surely, 2^8425409 is an apocalyptic number.

It is an amenable number.

8425409 is a deficient number, since it is larger than the sum of its proper divisors (7171).

8425409 is a wasteful number, since it uses less digits than its factorization.

8425409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7170.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 8425409 is about 2902.6555083234. The cubic root of 8425409 is about 203.4840302431.

The spelling of 8425409 in words is "eight million, four hundred twenty-five thousand, four hundred nine".