18305869 has 2 divisors, whose sum is σ = 18305870. Its totient is φ = 18305868.

The previous prime is 18305867. The next prime is 18305879. The reversal of 18305869 is 96850381.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16240900 + 2064969 = 4030^2 + 1437^2 .

It is a cyclic number.

It is not a de Polignac number, because 18305869 - 2¹ = 18305867 is a prime.

It is a super-2 number, since 2×18305869² = 670209679690322, which contains 22 as substring.

Together with 18305867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18305867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9152934 + 9152935.

It is an arithmetic number, because the mean of its divisors is an integer number (9152935).

Almost surely, 2^18305869 is an apocalyptic number.

It is an amenable number.

18305869 is a deficient number, since it is larger than the sum of its proper divisors (1).

18305869 is an equidigital number, since it uses as much as digits as its factorization.

18305869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 18305869 is about 4278.5358476937. The cubic root of 18305869 is about 263.5502606400.

The spelling of 18305869 in words is "eighteen million, three hundred five thousand, eight hundred sixty-nine".