18764329 has 2 divisors, whose sum is σ = 18764330. Its totient is φ = 18764328.

The previous prime is 18764321. The next prime is 18764351. The reversal of 18764329 is 92346781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17239104 + 1525225 = 4152^2 + 1235^2 .

It is a cyclic number.

It is not a de Polignac number, because 18764329 - 2³ = 18764321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18764291 and 18764300.

It is not a weakly prime, because it can be changed into another prime (18764321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9382164 + 9382165.

It is an arithmetic number, because the mean of its divisors is an integer number (9382165).

Almost surely, 2^18764329 is an apocalyptic number.

It is an amenable number.

18764329 is a deficient number, since it is larger than the sum of its proper divisors (1).

18764329 is an equidigital number, since it uses as much as digits as its factorization.

18764329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 18764329 is about 4331.7812733332. The cubic root of 18764329 is about 265.7322998842.

It can be divided in two parts, 187 and 64329, that added together give a square (64516 = 254²).

The spelling of 18764329 in words is "eighteen million, seven hundred sixty-four thousand, three hundred twenty-nine".