30028993 has 4 divisors (see below), whose sum is σ = 30040000. Its totient is φ = 30017988.

The previous prime is 30028979. The next prime is 30029009. The reversal of 30028993 is 39982003.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30028993 is a prime.

It is a super-3 number, since 3×30028993³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30028903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1996 + ... + 8002.

It is an arithmetic number, because the mean of its divisors is an integer number (7510000).

Almost surely, 2^30028993 is an apocalyptic number.

It is an amenable number.

30028993 is a deficient number, since it is larger than the sum of its proper divisors (11007).

30028993 is an equidigital number, since it uses as much as digits as its factorization.

30028993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11006.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 30028993 is about 5479.8716225839. The cubic root of 30028993 is about 310.8233161357.

The spelling of 30028993 in words is "thirty million, twenty-eight thousand, nine hundred ninety-three".