18009149 has 8 divisors (see below), whose sum is σ = 18283320. Its totient is φ = 17737216.

The previous prime is 18009143. The next prime is 18009151. The reversal of 18009149 is 94190081.

It can be written as a sum of positive squares in 4 ways, for example, as 5808100 + 12201049 = 2410^2 + 3493^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18009149 - 2⁴ = 18009133 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 (18009143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21857 + ... + 22665.

It is an arithmetic number, because the mean of its divisors is an integer number (2285415).

Almost surely, 2^18009149 is an apocalyptic number.

It is an amenable number.

18009149 is a deficient number, since it is larger than the sum of its proper divisors (274171).

18009149 is a wasteful number, since it uses less digits than its factorization.

18009149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 18009149 is about 4243.7187701355. The cubic root of 18009149 is about 262.1185340539.

The spelling of 18009149 in words is "eighteen million, nine thousand, one hundred forty-nine".