30640889 has 2 divisors, whose sum is σ = 30640890. Its totient is φ = 30640888.

The previous prime is 30640871. The next prime is 30640891. The reversal of 30640889 is 98804603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30063289 + 577600 = 5483^2 + 760^2 .

It is a cyclic number.

It is not a de Polignac number, because 30640889 - 2¹⁶ = 30575353 is a prime.

Together with 30640891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30640829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15320444 + 15320445.

It is an arithmetic number, because the mean of its divisors is an integer number (15320445).

Almost surely, 2^30640889 is an apocalyptic number.

It is an amenable number.

30640889 is a deficient number, since it is larger than the sum of its proper divisors (1).

30640889 is an equidigital number, since it uses as much as digits as its factorization.

30640889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 30640889 is about 5535.4213028459. The cubic root of 30640889 is about 312.9203354844.

The spelling of 30640889 in words is "thirty million, six hundred forty thousand, eight hundred eighty-nine".