18471427 has 4 divisors (see below), whose sum is σ = 19892320. Its totient is φ = 17050536.

The previous prime is 18471421. The next prime is 18471433. The reversal of 18471427 is 72417481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72417481 = 4673 ⋅15497.

It is an interprime number because it is at equal distance from previous prime (18471421) and next prime (18471433).

It is a cyclic number.

It is not a de Polignac number, because 18471427 - 2¹¹ = 18469379 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18471392 and 18471401.

It is not an unprimeable number, because it can be changed into a prime (18471421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 710427 + ... + 710452.

It is an arithmetic number, because the mean of its divisors is an integer number (4973080).

Almost surely, 2^18471427 is an apocalyptic number.

18471427 is a deficient number, since it is larger than the sum of its proper divisors (1420893).

18471427 is a wasteful number, since it uses less digits than its factorization.

18471427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420892.

The product of its digits is 12544, while the sum is 34.

The square root of 18471427 is about 4297.8398062282. The cubic root of 18471427 is about 264.3423922547.

The spelling of 18471427 in words is "eighteen million, four hundred seventy-one thousand, four hundred twenty-seven".