18038530 has 16 divisors (see below), whose sum is σ = 34379640. Its totient is φ = 6790912.

The previous prime is 18038453. The next prime is 18038533. The reversal of 18038530 is 3583081.

It can be written as a sum of positive squares in 4 ways, for example, as 18037009 + 1521 = 4247^2 + 39^2 .

It is not an unprimeable number, because it can be changed into a prime (18038533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52885 + ... + 53224.

Almost surely, 2^18038530 is an apocalyptic number.

18038530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18038530 is a deficient number, since it is larger than the sum of its proper divisors (16341110).

18038530 is a wasteful number, since it uses less digits than its factorization.

18038530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106133.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 18038530 is about 4247.1790638022. The cubic root of 18038530 is about 262.2610009068.

The spelling of 18038530 in words is "eighteen million, thirty-eight thousand, five hundred thirty".