30138445 has 4 divisors (see below), whose sum is σ = 36166140. Its totient is φ = 24110752.

The previous prime is 30138413. The next prime is 30138469. The reversal of 30138445 is 54483103.

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 8404201 + 21734244 = 2899^2 + 4662^2 .

It is a cyclic number.

It is not a de Polignac number, because 30138445 - 2⁵ = 30138413 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 3013840 + ... + 3013849.

It is an arithmetic number, because the mean of its divisors is an integer number (9041535).

Almost surely, 2^30138445 is an apocalyptic number.

It is an amenable number.

30138445 is a deficient number, since it is larger than the sum of its proper divisors (6027695).

30138445 is an equidigital number, since it uses as much as digits as its factorization.

30138445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6027694.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 30138445 is about 5489.8492693334. The cubic root of 30138445 is about 311.2004958821.

The spelling of 30138445 in words is "thirty million, one hundred thirty-eight thousand, four hundred forty-five".