18680409 has 16 divisors (see below), whose sum is σ = 30191040. Its totient is φ = 11321280.

The previous prime is 18680377. The next prime is 18680411. The reversal of 18680409 is 90408681.

It is a happy number.

It is not a de Polignac number, because 18680409 - 2⁵ = 18680377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18680429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31152 + ... + 31745.

It is an arithmetic number, because the mean of its divisors is an integer number (1886940).

Almost surely, 2^18680409 is an apocalyptic number.

It is an amenable number.

18680409 is a deficient number, since it is larger than the sum of its proper divisors (11510631).

18680409 is a wasteful number, since it uses less digits than its factorization.

18680409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62917 (or 62911 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 18680409 is about 4322.0838723930. The cubic root of 18680409 is about 265.3355616183.

The spelling of 18680409 in words is "eighteen million, six hundred eighty thousand, four hundred nine".