18440363 has 2 divisors, whose sum is σ = 18440364. Its totient is φ = 18440362.

The previous prime is 18440351. The next prime is 18440369. The reversal of 18440363 is 36304481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18440363 - 2⁴ = 18440347 is a prime.

It is not a weakly prime, because it can be changed into another prime (18440369) 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, 9220181 + 9220182.

It is an arithmetic number, because the mean of its divisors is an integer number (9220182).

Almost surely, 2^18440363 is an apocalyptic number.

18440363 is a deficient number, since it is larger than the sum of its proper divisors (1).

18440363 is an equidigital number, since it uses as much as digits as its factorization.

18440363 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 18440363 is about 4294.2243769976. The cubic root of 18440363 is about 264.1941247065.

The spelling of 18440363 in words is "eighteen million, four hundred forty thousand, three hundred sixty-three".