18948609 has 9 divisors (see below), whose sum is σ = 27389089. Its totient is φ = 12623700.

The previous prime is 18948569. The next prime is 18948623. The reversal of 18948609 is 90684981.

The square root of 18948609 is 4353.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 18948609 - 2¹¹ = 18946561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18948649) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12334 + ... + 13784.

Almost surely, 2^18948609 is an apocalyptic number.

18948609 is the 4353-rd square number.

18948609 is the 2177-th centered octagonal number.

It is an amenable number.

18948609 is a deficient number, since it is larger than the sum of its proper divisors (8440480).

18948609 is an frugal number, since it uses more digits than its factorization.

18948609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2908 (or 1454 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The cubic root of 18948609 is about 266.5993654813.

The spelling of 18948609 in words is "eighteen million, nine hundred forty-eight thousand, six hundred nine".