18306949 has 6 divisors (see below), whose sum is σ = 18744486. Its totient is φ = 17879400.

The previous prime is 18306941. The next prime is 18306961. The reversal of 18306949 is 94960381.

It can be written as a sum of positive squares in only one way, i.e., 18122049 + 184900 = 4257^2 + 430^2 .

It is not a de Polignac number, because 18306949 - 2³ = 18306941 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 (18306941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3102 + ... + 6799.

It is an arithmetic number, because the mean of its divisors is an integer number (3124081).

Almost surely, 2^18306949 is an apocalyptic number.

It is an amenable number.

18306949 is a deficient number, since it is larger than the sum of its proper divisors (437537).

18306949 is an frugal number, since it uses more digits than its factorization.

18306949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9987 (or 9944 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 18306949 is about 4278.6620572324. The cubic root of 18306949 is about 263.5554434712. Note that the first 3 decimals are identical.

The spelling of 18306949 in words is "eighteen million, three hundred six thousand, nine hundred forty-nine".