18183949 has 12 divisors (see below), whose sum is σ = 21836928. Its totient is φ = 15082200.

The previous prime is 18183943. The next prime is 18183967. The reversal of 18183949 is 94938181.

It is not a de Polignac number, because 18183949 - 2³ = 18183941 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 (18183941) 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 11 ways as a sum of consecutive naturals, for example, 4467 + ... + 7504.

It is an arithmetic number, because the mean of its divisors is an integer number (1819744).

Almost surely, 2^18183949 is an apocalyptic number.

It is an amenable number.

18183949 is a deficient number, since it is larger than the sum of its proper divisors (3652979).

18183949 is a wasteful number, since it uses less digits than its factorization.

18183949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12016 (or 12009 counting only the distinct ones).

The product of its digits is 62208, while the sum is 43.

The square root of 18183949 is about 4264.2641803716. The cubic root of 18183949 is about 262.9638613136.

The spelling of 18183949 in words is "eighteen million, one hundred eighty-three thousand, nine hundred forty-nine".