18580409 has 2 divisors, whose sum is σ = 18580410. Its totient is φ = 18580408.

The previous prime is 18580403. The next prime is 18580427. The reversal of 18580409 is 90408581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14592400 + 3988009 = 3820^2 + 1997^2 .

It is a cyclic number.

It is not a de Polignac number, because 18580409 - 2⁸ = 18580153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18580403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9290204 + 9290205.

It is an arithmetic number, because the mean of its divisors is an integer number (9290205).

Almost surely, 2^18580409 is an apocalyptic number.

It is an amenable number.

18580409 is a deficient number, since it is larger than the sum of its proper divisors (1).

18580409 is an equidigital number, since it uses as much as digits as its factorization.

18580409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 18580409 is about 4310.4998550052. The cubic root of 18580409 is about 264.8612493059.

The spelling of 18580409 in words is "eighteen million, five hundred eighty thousand, four hundred nine".