18454509 has 12 divisors (see below), whose sum is σ = 26695552. Its totient is φ = 12285000.

The previous prime is 18454507. The next prime is 18454511. The reversal of 18454509 is 90545481.

It is an interprime number because it is at equal distance from previous prime (18454507) and next prime (18454511).

It is not a de Polignac number, because 18454509 - 2¹ = 18454507 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18454507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8484 + ... + 10434.

Almost surely, 2^18454509 is an apocalyptic number.

It is an amenable number.

18454509 is a deficient number, since it is larger than the sum of its proper divisors (8241043).

18454509 is a wasteful number, since it uses less digits than its factorization.

18454509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3008 (or 3005 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 18454509 is about 4295.8711572858. The cubic root of 18454509 is about 264.2616637755.

The spelling of 18454509 in words is "eighteen million, four hundred fifty-four thousand, five hundred nine".