18213803 has 2 divisors, whose sum is σ = 18213804. Its totient is φ = 18213802.

The previous prime is 18213781. The next prime is 18213823. The reversal of 18213803 is 30831281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18213803 - 2¹⁴ = 18197419 is a prime.

It is not a weakly prime, because it can be changed into another prime (18213823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9106901 + 9106902.

It is an arithmetic number, because the mean of its divisors is an integer number (9106902).

Almost surely, 2^18213803 is an apocalyptic number.

18213803 is a deficient number, since it is larger than the sum of its proper divisors (1).

18213803 is an equidigital number, since it uses as much as digits as its factorization.

18213803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 18213803 is about 4267.7632314832. The cubic root of 18213803 is about 263.1076920213.

The spelling of 18213803 in words is "eighteen million, two hundred thirteen thousand, eight hundred three".