30730321 has 4 divisors (see below), whose sum is σ = 30756672. Its totient is φ = 30703972.

The previous prime is 30730319. The next prime is 30730363. The reversal of 30730321 is 12303703.

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.

It is a cyclic number.

It is not a de Polignac number, because 30730321 - 2¹ = 30730319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30733321) 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, 11341 + ... + 13786.

It is an arithmetic number, because the mean of its divisors is an integer number (7689168).

Almost surely, 2^30730321 is an apocalyptic number.

It is an amenable number.

30730321 is a deficient number, since it is larger than the sum of its proper divisors (26351).

30730321 is a wasteful number, since it uses less digits than its factorization.

30730321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26350.

The product of its (nonzero) digits is 378, while the sum is 19.

The square root of 30730321 is about 5543.4935735509. The cubic root of 30730321 is about 313.2244814539.

It can be divided in two parts, 307 and 30321, that added together give a triangular number (30628 = T₂₄₇).

The spelling of 30730321 in words is "thirty million, seven hundred thirty thousand, three hundred twenty-one".