30004721 has 4 divisors (see below), whose sum is σ = 30015732. Its totient is φ = 29993712.

The previous prime is 30004717. The next prime is 30004729. The reversal of 30004721 is 12740003.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13104400 + 16900321 = 3620^2 + 4111^2 .

It is a cyclic number.

It is not a de Polignac number, because 30004721 - 2² = 30004717 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30004721.

It is not an unprimeable number, because it can be changed into a prime (30004729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1931 + ... + 7983.

It is an arithmetic number, because the mean of its divisors is an integer number (7503933).

Almost surely, 2^30004721 is an apocalyptic number.

It is an amenable number.

30004721 is a deficient number, since it is larger than the sum of its proper divisors (11011).

30004721 is an equidigital number, since it uses as much as digits as its factorization.

30004721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11010.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 30004721 is about 5477.6565244637. The cubic root of 30004721 is about 310.7395489012.

Adding to 30004721 its reverse (12740003), we get a palindrome (42744724).

The spelling of 30004721 in words is "thirty million, four thousand, seven hundred twenty-one".