18685057 has 4 divisors (see below), whose sum is σ = 19784196. Its totient is φ = 17585920.

The previous prime is 18685049. The next prime is 18685067. The reversal of 18685057 is 75058681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16128256 + 2556801 = 4016^2 + 1599^2 .

It is a cyclic number.

It is not a de Polignac number, because 18685057 - 2³ = 18685049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18685067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 549544 + ... + 549577.

It is an arithmetic number, because the mean of its divisors is an integer number (4946049).

Almost surely, 2^18685057 is an apocalyptic number.

18685057 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18685057 is a deficient number, since it is larger than the sum of its proper divisors (1099139).

18685057 is a wasteful number, since it uses less digits than its factorization.

18685057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099138.

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 18685057 is about 4322.6215425364. The cubic root of 18685057 is about 265.3575664438.

The spelling of 18685057 in words is "eighteen million, six hundred eighty-five thousand, fifty-seven".