326429989 has 2 divisors, whose sum is σ = 326429990. Its totient is φ = 326429988.

The previous prime is 326429959. The next prime is 326430001. The reversal of 326429989 is 989924623.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 322489764 + 3940225 = 17958^2 + 1985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-326429989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (326429959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163214994 + 163214995.

It is an arithmetic number, because the mean of its divisors is an integer number (163214995).

Almost surely, 2^326429989 is an apocalyptic number.

It is an amenable number.

326429989 is a deficient number, since it is larger than the sum of its proper divisors (1).

326429989 is an equidigital number, since it uses as much as digits as its factorization.

326429989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 52.

The square root of 326429989 is about 18067.3736054801. The cubic root of 326429989 is about 688.5413342805.

The spelling of 326429989 in words is "three hundred twenty-six million, four hundred twenty-nine thousand, nine hundred eighty-nine".