18428871 has 4 divisors (see below), whose sum is σ = 24571832. Its totient is φ = 12285912.

The previous prime is 18428869. The next prime is 18428873. The reversal of 18428871 is 17882481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17882481 = 3 ⋅5960827.

It is an interprime number because it is at equal distance from previous prime (18428869) and next prime (18428873).

It is not a de Polignac number, because 18428871 - 2¹ = 18428869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18428873) 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, 3071476 + ... + 3071481.

It is an arithmetic number, because the mean of its divisors is an integer number (6142958).

Almost surely, 2^18428871 is an apocalyptic number.

18428871 is a deficient number, since it is larger than the sum of its proper divisors (6142961).

18428871 is an equidigital number, since it uses as much as digits as its factorization.

18428871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6142960.

The product of its digits is 28672, while the sum is 39.

The square root of 18428871 is about 4292.8860921296. The cubic root of 18428871 is about 264.1392315391.

The spelling of 18428871 in words is "eighteen million, four hundred twenty-eight thousand, eight hundred seventy-one".