30304721 has 2 divisors, whose sum is σ = 30304722. Its totient is φ = 30304720.

The previous prime is 30304691. The next prime is 30304759. The reversal of 30304721 is 12740303.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17977600 + 12327121 = 4240^2 + 3511^2 .

It is an emirp because it is prime and its reverse (12740303) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30304721 - 2⁶ = 30304657 is a prime.

It is a super-2 number, since 2×30304721² = 1836752229775682, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 30304693 and 30304702.

It is not a weakly prime, because it can be changed into another prime (30304621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15152360 + 15152361.

It is an arithmetic number, because the mean of its divisors is an integer number (15152361).

Almost surely, 2^30304721 is an apocalyptic number.

It is an amenable number.

30304721 is a deficient number, since it is larger than the sum of its proper divisors (1).

30304721 is an equidigital number, since it uses as much as digits as its factorization.

30304721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 30304721 is about 5504.9723886683. The cubic root of 30304721 is about 311.7717518933.

The spelling of 30304721 in words is "thirty million, three hundred four thousand, seven hundred twenty-one".