18811130 has 16 divisors (see below), whose sum is σ = 36464904. Its totient is φ = 6945600.

The previous prime is 18811123. The next prime is 18811153. The reversal of 18811130 is 3111881.

It can be written as a sum of positive squares in 4 ways, for example, as 11580409 + 7230721 = 3403^2 + 2689^2 .

It is a super-2 number, since 2×18811130² = 707717223753800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18811096 and 18811105.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 72221 + ... + 72480.

Almost surely, 2^18811130 is an apocalyptic number.

18811130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18811130 is a deficient number, since it is larger than the sum of its proper divisors (17653774).

18811130 is a wasteful number, since it uses less digits than its factorization.

18811130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144721.

The product of its (nonzero) digits is 192, while the sum is 23.

The square root of 18811130 is about 4337.1799593745. The cubic root of 18811130 is about 265.9530416287.

The spelling of 18811130 in words is "eighteen million, eight hundred eleven thousand, one hundred thirty".