18149671 has 4 divisors (see below), whose sum is σ = 18265432. Its totient is φ = 18033912.

The previous prime is 18149653. The next prime is 18149701. The reversal of 18149671 is 17694181.

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 18149671 - 2⁷ = 18149543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18149671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18149611) 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, 57645 + ... + 57958.

It is an arithmetic number, because the mean of its divisors is an integer number (4566358).

Almost surely, 2^18149671 is an apocalyptic number.

18149671 is a deficient number, since it is larger than the sum of its proper divisors (115761).

18149671 is a wasteful number, since it uses less digits than its factorization.

18149671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115760.

The product of its digits is 12096, while the sum is 37.

The square root of 18149671 is about 4260.2430681828. The cubic root of 18149671 is about 262.7985223636.

The spelling of 18149671 in words is "eighteen million, one hundred forty-nine thousand, six hundred seventy-one".