18428857 has 2 divisors, whose sum is σ = 18428858. Its totient is φ = 18428856.

The previous prime is 18428807. The next prime is 18428869. The reversal of 18428857 is 75882481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15397776 + 3031081 = 3924^2 + 1741^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18428857 is a prime.

It is not a weakly prime, because it can be changed into another prime (18428807) 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 as a sum of consecutive naturals, namely, 9214428 + 9214429.

It is an arithmetic number, because the mean of its divisors is an integer number (9214429).

Almost surely, 2^18428857 is an apocalyptic number.

It is an amenable number.

18428857 is a deficient number, since it is larger than the sum of its proper divisors (1).

18428857 is an equidigital number, since it uses as much as digits as its factorization.

18428857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 143360, while the sum is 43.

The square root of 18428857 is about 4292.8844615247. The cubic root of 18428857 is about 264.1391646522.

The spelling of 18428857 in words is "eighteen million, four hundred twenty-eight thousand, eight hundred fifty-seven".