18126857 has 4 divisors (see below), whose sum is σ = 20716416. Its totient is φ = 15537300.

The previous prime is 18126853. The next prime is 18126869. The reversal of 18126857 is 75862181.

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: 75862181 = 347 ⋅218623.

It is a cyclic number.

It is not a de Polignac number, because 18126857 - 2² = 18126853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18126857.

It is not an unprimeable number, because it can be changed into a prime (18126853) 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, 1294769 + ... + 1294782.

It is an arithmetic number, because the mean of its divisors is an integer number (5179104).

Almost surely, 2^18126857 is an apocalyptic number.

It is an amenable number.

18126857 is a deficient number, since it is larger than the sum of its proper divisors (2589559).

18126857 is an equidigital number, since it uses as much as digits as its factorization.

18126857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2589558.

The product of its digits is 26880, while the sum is 38.

The square root of 18126857 is about 4257.5646794852. The cubic root of 18126857 is about 262.6883642725.

The spelling of 18126857 in words is "eighteen million, one hundred twenty-six thousand, eight hundred fifty-seven".