326889989 has 2 divisors, whose sum is σ = 326889990. Its totient is φ = 326889988.

The previous prime is 326889977. The next prime is 326890027. The reversal of 326889989 is 989988623.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253924225 + 72965764 = 15935^2 + 8542^2 .

It is a cyclic number.

It is not a de Polignac number, because 326889989 - 2⁸ = 326889733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (326889919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163444994 + 163444995.

It is an arithmetic number, because the mean of its divisors is an integer number (163444995).

Almost surely, 2^326889989 is an apocalyptic number.

It is an amenable number.

326889989 is a deficient number, since it is larger than the sum of its proper divisors (1).

326889989 is an equidigital number, since it uses as much as digits as its factorization.

326889989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13436928, while the sum is 62.

The square root of 326889989 is about 18080.0992530462. The cubic root of 326889989 is about 688.8646096783.

The spelling of 326889989 in words is "three hundred twenty-six million, eight hundred eighty-nine thousand, nine hundred eighty-nine".