18438803 has 2 divisors, whose sum is σ = 18438804. Its totient is φ = 18438802.

The previous prime is 18438799. The next prime is 18438817. The reversal of 18438803 is 30883481.

It is a weak prime.

It is an emirp because it is prime and its reverse (30883481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18438803 - 2² = 18438799 is a prime.

It is not a weakly prime, because it can be changed into another prime (18438883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9219401 + 9219402.

It is an arithmetic number, because the mean of its divisors is an integer number (9219402).

Almost surely, 2^18438803 is an apocalyptic number.

18438803 is a deficient number, since it is larger than the sum of its proper divisors (1).

18438803 is an equidigital number, since it uses as much as digits as its factorization.

18438803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 18438803 is about 4294.0427338349. The cubic root of 18438803 is about 264.1866744834.

The spelling of 18438803 in words is "eighteen million, four hundred thirty-eight thousand, eight hundred three".