326440005389 has 2 divisors, whose sum is σ = 326440005390. Its totient is φ = 326440005388.

The previous prime is 326440005349. The next prime is 326440005431. The reversal of 326440005389 is 983500044623.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220256569225 + 106183436164 = 469315^2 + 325858^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-326440005389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (326440005349) 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, 163220002694 + 163220002695.

It is an arithmetic number, because the mean of its divisors is an integer number (163220002695).

Almost surely, 2^326440005389 is an apocalyptic number.

It is an amenable number.

326440005389 is a deficient number, since it is larger than the sum of its proper divisors (1).

326440005389 is an equidigital number, since it uses as much as digits as its factorization.

326440005389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 326440005389 in words is "three hundred twenty-six billion, four hundred forty million, five thousand, three hundred eighty-nine".