18680385 has 16 divisors (see below), whose sum is σ = 30525696. Its totient is φ = 9750528.

The previous prime is 18680377. The next prime is 18680411. The reversal of 18680385 is 58308681.

It is a happy number.

It is not a de Polignac number, because 18680385 - 2³ = 18680377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12544 + ... + 13953.

It is an arithmetic number, because the mean of its divisors is an integer number (1907856).

Almost surely, 2^18680385 is an apocalyptic number.

18680385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18680385 is a deficient number, since it is larger than the sum of its proper divisors (11845311).

18680385 is a wasteful number, since it uses less digits than its factorization.

18680385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26552.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 18680385 is about 4322.0810959537. The cubic root of 18680385 is about 265.3354479867.

The spelling of 18680385 in words is "eighteen million, six hundred eighty thousand, three hundred eighty-five".