18508971 has 16 divisors (see below), whose sum is σ = 28141344. Its totient is φ = 10719744.

The previous prime is 18508969. The next prime is 18508979. The reversal of 18508971 is 17980581.

It is not a de Polignac number, because 18508971 - 2¹ = 18508969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (18508979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13296 + ... + 14621.

It is an arithmetic number, because the mean of its divisors is an integer number (1758834).

Almost surely, 2^18508971 is an apocalyptic number.

18508971 is a deficient number, since it is larger than the sum of its proper divisors (9632373).

18508971 is a wasteful number, since it uses less digits than its factorization.

18508971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27950.

The product of its (nonzero) digits is 20160, while the sum is 39.

The square root of 18508971 is about 4302.2053646938. The cubic root of 18508971 is about 264.5213669559.

The spelling of 18508971 in words is "eighteen million, five hundred eight thousand, nine hundred seventy-one".