18382409 has 2 divisors, whose sum is σ = 18382410. Its totient is φ = 18382408.

The previous prime is 18382393. The next prime is 18382447. The reversal of 18382409 is 90428381.

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., 18318400 + 64009 = 4280^2 + 253^2 .

It is a cyclic number.

It is not a de Polignac number, because 18382409 - 2⁴ = 18382393 is a prime.

It is a super-3 number, since 3×18382409³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (18582409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9191204 + 9191205.

It is an arithmetic number, because the mean of its divisors is an integer number (9191205).

Almost surely, 2^18382409 is an apocalyptic number.

It is an amenable number.

18382409 is a deficient number, since it is larger than the sum of its proper divisors (1).

18382409 is an equidigital number, since it uses as much as digits as its factorization.

18382409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 18382409 is about 4287.4711660838. The cubic root of 18382409 is about 263.9170662744.

The spelling of 18382409 in words is "eighteen million, three hundred eighty-two thousand, four hundred nine".