8502409 has 2 divisors, whose sum is σ = 8502410. Its totient is φ = 8502408.

The previous prime is 8502391. The next prime is 8502449. The reversal of 8502409 is 9042058.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8497225 + 5184 = 2915^2 + 72^2 .

It is a cyclic number.

It is not a de Polignac number, because 8502409 - 2¹¹ = 8500361 is a prime.

8502409 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8502449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4251204 + 4251205.

It is an arithmetic number, because the mean of its divisors is an integer number (4251205).

Almost surely, 2^8502409 is an apocalyptic number.

It is an amenable number.

8502409 is a deficient number, since it is larger than the sum of its proper divisors (1).

8502409 is an equidigital number, since it uses as much as digits as its factorization.

8502409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 8502409 is about 2915.8890582462. The cubic root of 8502409 is about 204.1020330927.

It can be divided in two parts, 8502 and 409, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 8502409 in words is "eight million, five hundred two thousand, four hundred nine".