18945289 has 8 divisors (see below), whose sum is σ = 20723040. Its totient is φ = 17176800.

The previous prime is 18945287. The next prime is 18945317. The reversal of 18945289 is 98254981.

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 18945289 - 2¹ = 18945287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18945281) 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, 2394 + ... + 6604.

It is an arithmetic number, because the mean of its divisors is an integer number (2590380).

Almost surely, 2^18945289 is an apocalyptic number.

It is an amenable number.

18945289 is a deficient number, since it is larger than the sum of its proper divisors (1777751).

18945289 is a wasteful number, since it uses less digits than its factorization.

18945289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4631.

The product of its digits is 207360, while the sum is 46.

The square root of 18945289 is about 4352.6186370965. The cubic root of 18945289 is about 266.5837942135.

The spelling of 18945289 in words is "eighteen million, nine hundred forty-five thousand, two hundred eighty-nine".