18891125 has 24 divisors (see below), whose sum is σ = 25935000. Its totient is φ = 13728000.

The previous prime is 18891113. The next prime is 18891137. The reversal of 18891125 is 52119881.

It is an interprime number because it is at equal distance from previous prime (18891113) and next prime (18891137).

It can be written as a sum of positive squares in 4 ways, for example, as 1234321 + 17656804 = 1111^2 + 4202^2 .

It is not a de Polignac number, because 18891125 - 2⁴ = 18891109 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14501 + ... + 15749.

It is an arithmetic number, because the mean of its divisors is an integer number (1080625).

Almost surely, 2^18891125 is an apocalyptic number.

It is an amenable number.

18891125 is a deficient number, since it is larger than the sum of its proper divisors (7043875).

18891125 is a wasteful number, since it uses less digits than its factorization.

18891125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286 (or 1265 counting only the distinct ones).

The product of its digits is 5760, while the sum is 35.

The square root of 18891125 is about 4346.3921820287. The cubic root of 18891125 is about 266.3295000901.

The spelling of 18891125 in words is "eighteen million, eight hundred ninety-one thousand, one hundred twenty-five".