18406489 has 2 divisors, whose sum is σ = 18406490. Its totient is φ = 18406488.

The previous prime is 18406483. The next prime is 18406511. The reversal of 18406489 is 98460481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9406489 + 9000000 = 3067^2 + 3000^2 .

It is a cyclic number.

It is not a de Polignac number, because 18406489 - 2⁹ = 18405977 is a prime.

It is not a weakly prime, because it can be changed into another prime (18406483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9203244 + 9203245.

It is an arithmetic number, because the mean of its divisors is an integer number (9203245).

Almost surely, 2^18406489 is an apocalyptic number.

It is an amenable number.

18406489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18406489 is an equidigital number, since it uses as much as digits as its factorization.

18406489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 18406489 is about 4290.2784291931. The cubic root of 18406489 is about 264.0322552034.

The spelling of 18406489 in words is "eighteen million, four hundred six thousand, four hundred eighty-nine".