18203049 has 10 divisors (see below), whose sum is σ = 27192330. Its totient is φ = 12135312.

The previous prime is 18203041. The next prime is 18203063. The reversal of 18203049 is 94030281.

It can be written as a sum of positive squares in only one way, i.e., 16257024 + 1946025 = 4032^2 + 1395^2 .

It is not a de Polignac number, because 18203049 - 2³ = 18203041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18203041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 112284 + ... + 112445.

It is an arithmetic number, because the mean of its divisors is an integer number (2719233).

Almost surely, 2^18203049 is an apocalyptic number.

It is an amenable number.

18203049 is a deficient number, since it is larger than the sum of its proper divisors (8989281).

18203049 is an equidigital number, since it uses as much as digits as its factorization.

18203049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224741 (or 224732 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 18203049 is about 4266.5031348869. The cubic root of 18203049 is about 263.0558994848.

The spelling of 18203049 in words is "eighteen million, two hundred three thousand, forty-nine".