18240829 has 2 divisors, whose sum is σ = 18240830. Its totient is φ = 18240828.

The previous prime is 18240793. The next prime is 18240839. The reversal of 18240829 is 92804281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17388900 + 851929 = 4170^2 + 923^2 .

It is an emirp because it is prime and its reverse (92804281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18240829 - 2¹³ = 18232637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18240794 and 18240803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18240839) 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, 9120414 + 9120415.

It is an arithmetic number, because the mean of its divisors is an integer number (9120415).

Almost surely, 2^18240829 is an apocalyptic number.

It is an amenable number.

18240829 is a deficient number, since it is larger than the sum of its proper divisors (1).

18240829 is an equidigital number, since it uses as much as digits as its factorization.

18240829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 18240829 is about 4270.9283534145. The cubic root of 18240829 is about 263.2377625024.

The spelling of 18240829 in words is "eighteen million, two hundred forty thousand, eight hundred twenty-nine".