18500001 has 8 divisors (see below), whose sum is σ = 26564160. Its totient is φ = 11384592.

The previous prime is 18499931. The next prime is 18500017. The reversal of 18500001 is 10000581.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18500001 - 2⁹ = 18499489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18500051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237141 + ... + 237218.

It is an arithmetic number, because the mean of its divisors is an integer number (3320520).

Almost surely, 2^18500001 is an apocalyptic number.

It is an amenable number.

18500001 is a deficient number, since it is larger than the sum of its proper divisors (8064159).

18500001 is a wasteful number, since it uses less digits than its factorization.

18500001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474375.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 18500001 is about 4301.1627497690. The cubic root of 18500001 is about 264.4786284001.

Adding to 18500001 its reverse (10000581), we get a palindrome (28500582).

The spelling of 18500001 in words is "eighteen million, five hundred thousand, one".