18213703 has 2 divisors, whose sum is σ = 18213704. Its totient is φ = 18213702.

The previous prime is 18213667. The next prime is 18213707. The reversal of 18213703 is 30731281.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18213703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18213707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9106851 + 9106852.

It is an arithmetic number, because the mean of its divisors is an integer number (9106852).

Almost surely, 2^18213703 is an apocalyptic number.

18213703 is a deficient number, since it is larger than the sum of its proper divisors (1).

18213703 is an equidigital number, since it uses as much as digits as its factorization.

18213703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 18213703 is about 4267.7515157282. The cubic root of 18213703 is about 263.1072105034.

Adding to 18213703 its reverse (30731281), we get a palindrome (48944984).

The spelling of 18213703 in words is "eighteen million, two hundred thirteen thousand, seven hundred three".