18219433 has 2 divisors, whose sum is σ = 18219434. Its totient is φ = 18219432.

The previous prime is 18219407. The next prime is 18219437. The reversal of 18219433 is 33491281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12588304 + 5631129 = 3548^2 + 2373^2 .

It is a cyclic number.

It is not a de Polignac number, because 18219433 - 2¹³ = 18211241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18219395 and 18219404.

It is not a weakly prime, because it can be changed into another prime (18219437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9109716 + 9109717.

It is an arithmetic number, because the mean of its divisors is an integer number (9109717).

Almost surely, 2^18219433 is an apocalyptic number.

It is an amenable number.

18219433 is a deficient number, since it is larger than the sum of its proper divisors (1).

18219433 is an equidigital number, since it uses as much as digits as its factorization.

18219433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 18219433 is about 4268.4227766237. The cubic root of 18219433 is about 263.1347986376.

The spelling of 18219433 in words is "eighteen million, two hundred nineteen thousand, four hundred thirty-three".