18428851 has 6 divisors (see below), whose sum is σ = 21437700. Its totient is φ = 15796116.

The previous prime is 18428807. The next prime is 18428857. The reversal of 18428851 is 15882481.

It is a happy number.

It is not a de Polignac number, because 18428851 - 2¹³ = 18420659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18428851.

It is not an unprimeable number, because it can be changed into a prime (18428857) 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 5 ways as a sum of consecutive naturals, for example, 188001 + ... + 188098.

It is an arithmetic number, because the mean of its divisors is an integer number (3572950).

Almost surely, 2^18428851 is an apocalyptic number.

18428851 is a deficient number, since it is larger than the sum of its proper divisors (3008849).

18428851 is an equidigital number, since it uses as much as digits as its factorization.

18428851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376113 (or 376106 counting only the distinct ones).

The product of its digits is 20480, while the sum is 37.

The square root of 18428851 is about 4292.8837626938. The cubic root of 18428851 is about 264.1391359864.

The spelling of 18428851 in words is "eighteen million, four hundred twenty-eight thousand, eight hundred fifty-one".