18487017 has 6 divisors (see below), whose sum is σ = 26703482. Its totient is φ = 12324672.

The previous prime is 18487003. The next prime is 18487037. The reversal of 18487017 is 71078481.

It can be written as a sum of positive squares in only one way, i.e., 12257001 + 6230016 = 3501^2 + 2496^2 .

It is not a de Polignac number, because 18487017 - 2¹⁹ = 17962729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18487037) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1027048 + ... + 1027065.

Almost surely, 2^18487017 is an apocalyptic number.

It is an amenable number.

18487017 is a deficient number, since it is larger than the sum of its proper divisors (8216465).

18487017 is a wasteful number, since it uses less digits than its factorization.

18487017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054119 (or 2054116 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 18487017 is about 4299.6531255440. The cubic root of 18487017 is about 264.4167402198.

The spelling of 18487017 in words is "eighteen million, four hundred eighty-seven thousand, seventeen".