30123505 has 4 divisors (see below), whose sum is σ = 36148212. Its totient is φ = 24098800.

The previous prime is 30123497. The next prime is 30123517. The reversal of 30123505 is 50532103.

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 22572001 + 7551504 = 4751^2 + 2748^2 .

It is not a de Polignac number, because 30123505 - 2³ = 30123497 is a prime.

It is a Duffinian number.

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, 3012346 + ... + 3012355.

It is an arithmetic number, because the mean of its divisors is an integer number (9037053).

Almost surely, 2^30123505 is an apocalyptic number.

It is an amenable number.

30123505 is a deficient number, since it is larger than the sum of its proper divisors (6024707).

30123505 is an equidigital number, since it uses as much as digits as its factorization.

30123505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6024706.

The product of its (nonzero) digits is 450, while the sum is 19.

The square root of 30123505 is about 5488.4884075672. The cubic root of 30123505 is about 311.1490654045.

Adding to 30123505 its reverse (50532103), we get a palindrome (80655608).

It can be divided in two parts, 30123 and 505, that added together give a triangular number (30628 = T₂₄₇).

The spelling of 30123505 in words is "thirty million, one hundred twenty-three thousand, five hundred five".