18746857 has 4 divisors (see below), whose sum is σ = 18758740. Its totient is φ = 18734976.

The previous prime is 18746831. The next prime is 18746867. The reversal of 18746857 is 75864781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75864781 = 31 ⋅2447251.

It can be written as a sum of positive squares in 2 ways, for example, as 10342656 + 8404201 = 3216^2 + 2899^2 .

It is a cyclic number.

It is not a de Polignac number, because 18746857 - 2⁷ = 18746729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18746867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3132 + ... + 6877.

It is an arithmetic number, because the mean of its divisors is an integer number (4689685).

Almost surely, 2^18746857 is an apocalyptic number.

It is an amenable number.

18746857 is a deficient number, since it is larger than the sum of its proper divisors (11883).

18746857 is a wasteful number, since it uses less digits than its factorization.

18746857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11882.

The product of its digits is 376320, while the sum is 46.

The square root of 18746857 is about 4329.7640813328. The cubic root of 18746857 is about 265.6497973067.

The spelling of 18746857 in words is "eighteen million, seven hundred forty-six thousand, eight hundred fifty-seven".