30939889 has 4 divisors (see below), whose sum is σ = 31021056. Its totient is φ = 30858724.

The previous prime is 30939869. The next prime is 30939907. The reversal of 30939889 is 98893903.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98893903 = 73 ⋅1354711.

It is a cyclic number.

It is not a de Polignac number, because 30939889 - 2²³ = 22551281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30939859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40009 + ... + 40774.

It is an arithmetic number, because the mean of its divisors is an integer number (7755264).

Almost surely, 2^30939889 is an apocalyptic number.

It is an amenable number.

30939889 is a deficient number, since it is larger than the sum of its proper divisors (81167).

30939889 is an equidigital number, since it uses as much as digits as its factorization.

30939889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81166.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 30939889 is about 5562.3636163056. The cubic root of 30939889 is about 313.9348892002.

The spelling of 30939889 in words is "thirty million, nine hundred thirty-nine thousand, eight hundred eighty-nine".