18286609 has 10 divisors (see below), whose sum is σ = 20131250. Its totient is φ = 16610880.

The previous prime is 18286589. The next prime is 18286613. The reversal of 18286609 is 90668281.

It can be written as a sum of positive squares in only one way, i.e., 14992384 + 3294225 = 3872^2 + 1815^2 .

It is not a de Polignac number, because 18286609 - 2⁹ = 18286097 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 (18286649) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 14017 + ... + 15265.

It is an arithmetic number, because the mean of its divisors is an integer number (2013125).

Almost surely, 2^18286609 is an apocalyptic number.

It is an amenable number.

18286609 is a deficient number, since it is larger than the sum of its proper divisors (1844641).

18286609 is an frugal number, since it uses more digits than its factorization.

18286609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293 (or 1260 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 18286609 is about 4276.2844853915. The cubic root of 18286609 is about 263.4577992324.

The spelling of 18286609 in words is "eighteen million, two hundred eighty-six thousand, six hundred nine".