30879889 has 2 divisors, whose sum is σ = 30879890. Its totient is φ = 30879888.

The previous prime is 30879887. The next prime is 30879899. The reversal of 30879889 is 98897803.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25553025 + 5326864 = 5055^2 + 2308^2 .

It is a cyclic number.

It is not a de Polignac number, because 30879889 - 2¹ = 30879887 is a prime.

Together with 30879887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (30879887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15439944 + 15439945.

It is an arithmetic number, because the mean of its divisors is an integer number (15439945).

Almost surely, 2^30879889 is an apocalyptic number.

It is an amenable number.

30879889 is a deficient number, since it is larger than the sum of its proper divisors (1).

30879889 is an equidigital number, since it uses as much as digits as its factorization.

30879889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 30879889 is about 5556.9676083274. The cubic root of 30879889 is about 313.7318257437.

The spelling of 30879889 in words is "thirty million, eight hundred seventy-nine thousand, eight hundred eighty-nine".