1438326209 has 2 divisors, whose sum is σ = 1438326210. Its totient is φ = 1438326208.

The previous prime is 1438326203. The next prime is 1438326247. The reversal of 1438326209 is 9026238341.

It is an a-pointer prime, because the next prime (1438326247) can be obtained adding 1438326209 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1421516209 + 16810000 = 37703^2 + 4100^2 .

It is a cyclic number.

It is not a de Polignac number, because 1438326209 - 2⁴ = 1438326193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1438326203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719163104 + 719163105.

It is an arithmetic number, because the mean of its divisors is an integer number (719163105).

Almost surely, 2^1438326209 is an apocalyptic number.

It is an amenable number.

1438326209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438326209 is an equidigital number, since it uses as much as digits as its factorization.

1438326209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 1438326209 is about 37925.2713767482. The cubic root of 1438326209 is about 1128.8055379060.

The spelling of 1438326209 in words is "one billion, four hundred thirty-eight million, three hundred twenty-six thousand, two hundred nine".