30138443 has 4 divisors (see below), whose sum is σ = 30156408. Its totient is φ = 30120480.

The previous prime is 30138413. The next prime is 30138469. The reversal of 30138443 is 34483103.

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

It is a cyclic number.

It is not a de Polignac number, because 30138443 - 2¹⁶ = 30072907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30138413) 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, 6173 + ... + 9918.

It is an arithmetic number, because the mean of its divisors is an integer number (7539102).

Almost surely, 2^30138443 is an apocalyptic number.

30138443 is a deficient number, since it is larger than the sum of its proper divisors (17965).

30138443 is a wasteful number, since it uses less digits than its factorization.

30138443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17964.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 30138443 is about 5489.8490871790. The cubic root of 30138443 is about 311.2004889983.

The spelling of 30138443 in words is "thirty million, one hundred thirty-eight thousand, four hundred forty-three".