30005945 has 4 divisors (see below), whose sum is σ = 36007140. Its totient is φ = 24004752.

The previous prime is 30005917. The next prime is 30005957. The reversal of 30005945 is 54950003.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54950003 = 47 ⋅1169149.

It can be written as a sum of positive squares in 2 ways, for example, as 4280761 + 25725184 = 2069^2 + 5072^2 .

It is a cyclic number.

It is not a de Polignac number, because 30005945 - 2¹⁰ = 30004921 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3000590 + ... + 3000599.

It is an arithmetic number, because the mean of its divisors is an integer number (9001785).

Almost surely, 2^30005945 is an apocalyptic number.

It is an amenable number.

30005945 is a deficient number, since it is larger than the sum of its proper divisors (6001195).

30005945 is an equidigital number, since it uses as much as digits as its factorization.

30005945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6001194.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 30005945 is about 5477.7682499354. The cubic root of 30005945 is about 310.7437742367.

Adding to 30005945 its reverse (54950003), we get a palindrome (84955948).

The spelling of 30005945 in words is "thirty million, five thousand, nine hundred forty-five".