18471849 has 16 divisors (see below), whose sum is σ = 27068160. Its totient is φ = 11111760.

The previous prime is 18471821. The next prime is 18471863. The reversal of 18471849 is 94817481.

It is not a de Polignac number, because 18471849 - 2¹³ = 18463657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18471849.

It is not an unprimeable number, because it can be changed into a prime (18471889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2574 + ... + 6600.

It is an arithmetic number, because the mean of its divisors is an integer number (1691760).

Almost surely, 2^18471849 is an apocalyptic number.

It is an amenable number.

18471849 is a deficient number, since it is larger than the sum of its proper divisors (8596311).

18471849 is a wasteful number, since it uses less digits than its factorization.

18471849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4180.

The product of its digits is 64512, while the sum is 42.

The square root of 18471849 is about 4297.8889003789. Note that the first 3 decimals coincide. The cubic root of 18471849 is about 264.3444053033.

The spelling of 18471849 in words is "eighteen million, four hundred seventy-one thousand, eight hundred forty-nine".