18105857 has 16 divisors (see below), whose sum is σ = 23058432. Its totient is φ = 13805520.

The previous prime is 18105851. The next prime is 18105863. The reversal of 18105857 is 75850181.

It is an interprime number because it is at equal distance from previous prime (18105851) and next prime (18105863).

It is a cyclic number.

It is not a de Polignac number, because 18105857 - 2⁸ = 18105601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18105851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1118 + ... + 6120.

It is an arithmetic number, because the mean of its divisors is an integer number (1441152).

Almost surely, 2^18105857 is an apocalyptic number.

It is an amenable number.

18105857 is a deficient number, since it is larger than the sum of its proper divisors (4952575).

18105857 is a wasteful number, since it uses less digits than its factorization.

18105857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5068.

The product of its (nonzero) digits is 11200, while the sum is 35.

The square root of 18105857 is about 4255.0977662094. The cubic root of 18105857 is about 262.5868834091.

It can be divided in two parts, 1810 and 5857, that added together give a palindrome (7667).

The spelling of 18105857 in words is "eighteen million, one hundred five thousand, eight hundred fifty-seven".