18429871 has 4 divisors (see below), whose sum is σ = 18562600. Its totient is φ = 18297144.

The previous prime is 18429857. The next prime is 18429883. The reversal of 18429871 is 17892481.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18429871 - 2⁵ = 18429839 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 (18424871) 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, 66156 + ... + 66433.

It is an arithmetic number, because the mean of its divisors is an integer number (4640650).

Almost surely, 2^18429871 is an apocalyptic number.

18429871 is a deficient number, since it is larger than the sum of its proper divisors (132729).

18429871 is a wasteful number, since it uses less digits than its factorization.

18429871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132728.

The product of its digits is 32256, while the sum is 40.

The square root of 18429871 is about 4293.0025623100. The cubic root of 18429871 is about 264.1440090872.

The spelling of 18429871 in words is "eighteen million, four hundred twenty-nine thousand, eight hundred seventy-one".