18540189 has 6 divisors (see below), whose sum is σ = 26780286. Its totient is φ = 12360120.

The previous prime is 18540187. The next prime is 18540191. The reversal of 18540189 is 98104581.

It is an interprime number because it is at equal distance from previous prime (18540187) and next prime (18540191).

It can be written as a sum of positive squares in only one way, i.e., 11168964 + 7371225 = 3342^2 + 2715^2 .

It is not a de Polignac number, because 18540189 - 2¹ = 18540187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18540187) 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, 1030002 + ... + 1030019.

It is an arithmetic number, because the mean of its divisors is an integer number (4463381).

Almost surely, 2^18540189 is an apocalyptic number.

It is an amenable number.

18540189 is a deficient number, since it is larger than the sum of its proper divisors (8240097).

18540189 is a wasteful number, since it uses less digits than its factorization.

18540189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2060027 (or 2060024 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 18540189 is about 4305.8319753562. The cubic root of 18540189 is about 264.6700010014.

The spelling of 18540189 in words is "eighteen million, five hundred forty thousand, one hundred eighty-nine".