8623409 has 2 divisors, whose sum is σ = 8623410. Its totient is φ = 8623408.

The previous prime is 8623393. The next prime is 8623423. The reversal of 8623409 is 9043268.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4906225 + 3717184 = 2215^2 + 1928^2 .

It is a cyclic number.

It is not a de Polignac number, because 8623409 - 2⁴ = 8623393 is a prime.

It is a Chen prime.

It is equal to p₅₇₈₉₂₁ and since 8623409 and 578921 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (8623429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4311704 + 4311705.

It is an arithmetic number, because the mean of its divisors is an integer number (4311705).

Almost surely, 2^8623409 is an apocalyptic number.

It is an amenable number.

8623409 is a deficient number, since it is larger than the sum of its proper divisors (1).

8623409 is an equidigital number, since it uses as much as digits as its factorization.

8623409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 8623409 is about 2936.5641487970. The cubic root of 8623409 is about 205.0656858712.

The spelling of 8623409 in words is "eight million, six hundred twenty-three thousand, four hundred nine".