18245857 has 4 divisors (see below), whose sum is σ = 20852416. Its totient is φ = 15639300.

The previous prime is 18245789. The next prime is 18245863. The reversal of 18245857 is 75854281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75854281 = 83 ⋅913907.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18245857 is a prime.

It is a super-2 number, since 2×18245857² = 665822595328898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18245867) 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 3 ways as a sum of consecutive naturals, for example, 1303269 + ... + 1303282.

It is an arithmetic number, because the mean of its divisors is an integer number (5213104).

Almost surely, 2^18245857 is an apocalyptic number.

It is an amenable number.

18245857 is a deficient number, since it is larger than the sum of its proper divisors (2606559).

18245857 is an equidigital number, since it uses as much as digits as its factorization.

18245857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2606558.

The product of its digits is 89600, while the sum is 40.

The square root of 18245857 is about 4271.5169436630. The cubic root of 18245857 is about 263.2619470370.

The spelling of 18245857 in words is "eighteen million, two hundred forty-five thousand, eight hundred fifty-seven".