18203849 has 2 divisors, whose sum is σ = 18203850. Its totient is φ = 18203848.

The previous prime is 18203831. The next prime is 18203863. The reversal of 18203849 is 94830281.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9412624 + 8791225 = 3068^2 + 2965^2 .

It is a cyclic number.

It is not a de Polignac number, because 18203849 - 2²⁰ = 17155273 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18203819) 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 as a sum of consecutive naturals, namely, 9101924 + 9101925.

It is an arithmetic number, because the mean of its divisors is an integer number (9101925).

Almost surely, 2^18203849 is an apocalyptic number.

It is an amenable number.

18203849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18203849 is an equidigital number, since it uses as much as digits as its factorization.

18203849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 18203849 is about 4266.5968874502. The cubic root of 18203849 is about 263.0597530817.

The spelling of 18203849 in words is "eighteen million, two hundred three thousand, eight hundred forty-nine".