18119871 has 36 divisors (see below), whose sum is σ = 32892496. Its totient is φ = 9408960.

The previous prime is 18119869. The next prime is 18119879. The reversal of 18119871 is 17891181.

It is a happy number.

It is not a de Polignac number, because 18119871 - 2¹ = 18119869 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18119879) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6435 + ... + 8811.

Almost surely, 2^18119871 is an apocalyptic number.

18119871 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18119871 is a deficient number, since it is larger than the sum of its proper divisors (14772625).

18119871 is a wasteful number, since it uses less digits than its factorization.

18119871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2412 (or 2398 counting only the distinct ones).

The product of its digits is 4032, while the sum is 36.

The square root of 18119871 is about 4256.7441783598. The cubic root of 18119871 is about 262.6546136759.

The spelling of 18119871 in words is "eighteen million, one hundred nineteen thousand, eight hundred seventy-one".