18154971 has 12 divisors (see below), whose sum is σ = 26261248. Its totient is φ = 12086064.

The previous prime is 18154967. The next prime is 18154973. The reversal of 18154971 is 17945181.

It is not a de Polignac number, because 18154971 - 2² = 18154967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18154973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10086 + ... + 11748.

Almost surely, 2^18154971 is an apocalyptic number.

18154971 is a deficient number, since it is larger than the sum of its proper divisors (8106277).

18154971 is a wasteful number, since it uses less digits than its factorization.

18154971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2882 (or 2879 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 18154971 is about 4260.8650530145. The cubic root of 18154971 is about 262.8241003592.

It can be divided in two parts, 1815 and 4971, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 18154971 in words is "eighteen million, one hundred fifty-four thousand, nine hundred seventy-one".