18260489 has 4 divisors (see below), whose sum is σ = 19665156. Its totient is φ = 16855824.

The previous prime is 18260479. The next prime is 18260491. The reversal of 18260489 is 98406281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7795264 + 10465225 = 2792^2 + 3235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18260489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18260449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 702314 + ... + 702339.

It is an arithmetic number, because the mean of its divisors is an integer number (4916289).

Almost surely, 2^18260489 is an apocalyptic number.

It is an amenable number.

18260489 is a deficient number, since it is larger than the sum of its proper divisors (1404667).

18260489 is a wasteful number, since it uses less digits than its factorization.

18260489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404666.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 18260489 is about 4273.2293409083. The cubic root of 18260489 is about 263.3323012653.

The spelling of 18260489 in words is "eighteen million, two hundred sixty thousand, four hundred eighty-nine".