30440321 has 4 divisors (see below), whose sum is σ = 30719700. Its totient is φ = 30160944.

The previous prime is 30440297. The next prime is 30440341. The reversal of 30440321 is 12304403.

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 7639696 + 22800625 = 2764^2 + 4775^2 .

It is a cyclic number.

It is not a de Polignac number, because 30440321 - 2⁶ = 30440257 is a prime.

It is a super-2 number, since 2×30440321² = 1853226285166082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 30440321.

It is not an unprimeable number, because it can be changed into a prime (30440341) 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, 139526 + ... + 139743.

It is an arithmetic number, because the mean of its divisors is an integer number (7679925).

Almost surely, 2^30440321 is an apocalyptic number.

It is an amenable number.

30440321 is a deficient number, since it is larger than the sum of its proper divisors (279379).

30440321 is a wasteful number, since it uses less digits than its factorization.

30440321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279378.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 30440321 is about 5517.2747801791. The cubic root of 30440321 is about 312.2360728386.

Adding to 30440321 its reverse (12304403), we get a palindrome (42744724).

The spelling of 30440321 in words is "thirty million, four hundred forty thousand, three hundred twenty-one".