30427891 has 4 divisors (see below), whose sum is σ = 32768512. Its totient is φ = 28087272.

The previous prime is 30427889. The next prime is 30427907. The reversal of 30427891 is 19872403.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 30427891 - 2¹ = 30427889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30427861) 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, 1170291 + ... + 1170316.

It is an arithmetic number, because the mean of its divisors is an integer number (8192128).

Almost surely, 2^30427891 is an apocalyptic number.

30427891 is a deficient number, since it is larger than the sum of its proper divisors (2340621).

30427891 is a wasteful number, since it uses less digits than its factorization.

30427891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340620.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 30427891 is about 5516.1482032302. The cubic root of 30427891 is about 312.1935675622.

The spelling of 30427891 in words is "thirty million, four hundred twenty-seven thousand, eight hundred ninety-one".