18308029 has 2 divisors, whose sum is σ = 18308030. Its totient is φ = 18308028.

The previous prime is 18307999. The next prime is 18308053. The reversal of 18308029 is 92080381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13155129 + 5152900 = 3627^2 + 2270^2 .

It is a cyclic number.

It is not a de Polignac number, because 18308029 - 2¹⁵ = 18275261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18308089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9154014 + 9154015.

It is an arithmetic number, because the mean of its divisors is an integer number (9154015).

Almost surely, 2^18308029 is an apocalyptic number.

It is an amenable number.

18308029 is a deficient number, since it is larger than the sum of its proper divisors (1).

18308029 is an equidigital number, since it uses as much as digits as its factorization.

18308029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 18308029 is about 4278.7882630483. The cubic root of 18308029 is about 263.5606260985.

The spelling of 18308029 in words is "eighteen million, three hundred eight thousand, twenty-nine".