18306803 has 2 divisors, whose sum is σ = 18306804. Its totient is φ = 18306802.

The previous prime is 18306779. The next prime is 18306809. The reversal of 18306803 is 30860381.

It is a strong prime.

It is an emirp because it is prime and its reverse (30860381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18306803 - 2¹² = 18302707 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18306809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9153401 + 9153402.

It is an arithmetic number, because the mean of its divisors is an integer number (9153402).

Almost surely, 2^18306803 is an apocalyptic number.

18306803 is a deficient number, since it is larger than the sum of its proper divisors (1).

18306803 is an equidigital number, since it uses as much as digits as its factorization.

18306803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 18306803 is about 4278.6449957901. The cubic root of 18306803 is about 263.5547428411.

The spelling of 18306803 in words is "eighteen million, three hundred six thousand, eight hundred three".