18818629 has 2 divisors, whose sum is σ = 18818630. Its totient is φ = 18818628.

The previous prime is 18818603. The next prime is 18818641. The reversal of 18818629 is 92681881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13068225 + 5750404 = 3615^2 + 2398^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18818629 is a prime.

It is a super-3 number, since 3×18818629³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18818029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9409314 + 9409315.

It is an arithmetic number, because the mean of its divisors is an integer number (9409315).

Almost surely, 2^18818629 is an apocalyptic number.

It is an amenable number.

18818629 is a deficient number, since it is larger than the sum of its proper divisors (1).

18818629 is an equidigital number, since it uses as much as digits as its factorization.

18818629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 43.

The square root of 18818629 is about 4338.0443750612. The cubic root of 18818629 is about 265.9883773918.

The spelling of 18818629 in words is "eighteen million, eight hundred eighteen thousand, six hundred twenty-nine".