30742321 has 4 divisors (see below), whose sum is σ = 30762532. Its totient is φ = 30722112.

The previous prime is 30742303. The next prime is 30742357. The reversal of 30742321 is 12324703.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5340721 + 25401600 = 2311^2 + 5040^2 .

It is a cyclic number.

It is not a de Polignac number, because 30742321 - 2⁷ = 30742193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30742292 and 30742301.

It is not an unprimeable number, because it can be changed into a prime (30742381) 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, 7620 + ... + 10933.

It is an arithmetic number, because the mean of its divisors is an integer number (7690633).

Almost surely, 2^30742321 is an apocalyptic number.

It is an amenable number.

30742321 is a deficient number, since it is larger than the sum of its proper divisors (20211).

30742321 is a wasteful number, since it uses less digits than its factorization.

30742321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20210.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 30742321 is about 5544.5758178602. The cubic root of 30742321 is about 313.2652468881.

The spelling of 30742321 in words is "thirty million, seven hundred forty-two thousand, three hundred twenty-one".