18030149 has 4 divisors (see below), whose sum is σ = 19090764. Its totient is φ = 16969536.

The previous prime is 18030143. The next prime is 18030151. The reversal of 18030149 is 94103081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16120225 + 1909924 = 4015^2 + 1382^2 .

It is not a de Polignac number, because 18030149 - 2¹² = 18026053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18030143) 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 3 ways as a sum of consecutive naturals, for example, 530282 + ... + 530315.

It is an arithmetic number, because the mean of its divisors is an integer number (4772691).

Almost surely, 2^18030149 is an apocalyptic number.

It is an amenable number.

18030149 is a deficient number, since it is larger than the sum of its proper divisors (1060615).

18030149 is a wasteful number, since it uses less digits than its factorization.

18030149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060614.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 18030149 is about 4246.1922942797. The cubic root of 18030149 is about 262.2203776789.

The spelling of 18030149 in words is "eighteen million, thirty thousand, one hundred forty-nine".