30389621 has 4 divisors (see below), whose sum is σ = 30417132. Its totient is φ = 30362112.

The previous prime is 30389609. The next prime is 30389629. The reversal of 30389621 is 12698303.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12698303 = 17 ⋅746959.

It can be written as a sum of positive squares in 2 ways, for example, as 18062500 + 12327121 = 4250^2 + 3511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30389621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30389629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12026 + ... + 14331.

It is an arithmetic number, because the mean of its divisors is an integer number (7604283).

Almost surely, 2^30389621 is an apocalyptic number.

It is an amenable number.

30389621 is a deficient number, since it is larger than the sum of its proper divisors (27511).

30389621 is a wasteful number, since it uses less digits than its factorization.

30389621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27510.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 30389621 is about 5512.6782057363. The cubic root of 30389621 is about 312.0626278234.

The spelling of 30389621 in words is "thirty million, three hundred eighty-nine thousand, six hundred twenty-one".