18642671 has 4 divisors (see below), whose sum is σ = 18747000. Its totient is φ = 18538344.

The previous prime is 18642647. The next prime is 18642703. The reversal of 18642671 is 17624681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17624681 = 311 ⋅56671.

It is a cyclic number.

It is not a de Polignac number, because 18642671 - 2¹⁴ = 18626287 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 (18642601) 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, 51896 + ... + 52253.

It is an arithmetic number, because the mean of its divisors is an integer number (4686750).

Almost surely, 2^18642671 is an apocalyptic number.

18642671 is a deficient number, since it is larger than the sum of its proper divisors (104329).

18642671 is a wasteful number, since it uses less digits than its factorization.

18642671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104328.

The product of its digits is 16128, while the sum is 35.

The square root of 18642671 is about 4317.7159471183. The cubic root of 18642671 is about 265.1567649641.

The spelling of 18642671 in words is "eighteen million, six hundred forty-two thousand, six hundred seventy-one".