18489505 has 8 divisors (see below), whose sum is σ = 22255272. Its totient is φ = 14746368.

The previous prime is 18489503. The next prime is 18489509. The reversal of 18489505 is 50598481.

It can be written as a sum of positive squares in 4 ways, for example, as 992016 + 17497489 = 996^2 + 4183^2 .

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 18489505 - 2¹ = 18489503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18489503) 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, 3802 + ... + 7171.

It is an arithmetic number, because the mean of its divisors is an integer number (2781909).

Almost surely, 2^18489505 is an apocalyptic number.

It is an amenable number.

18489505 is a deficient number, since it is larger than the sum of its proper divisors (3765767).

18489505 is a wasteful number, since it uses less digits than its factorization.

18489505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11315.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 18489505 is about 4299.9424414752. The cubic root of 18489505 is about 264.4286015049.

The spelling of 18489505 in words is "eighteen million, four hundred eighty-nine thousand, five hundred five".