30712205 has 4 divisors (see below), whose sum is σ = 36854652. Its totient is φ = 24569760.

The previous prime is 30712193. The next prime is 30712211. The reversal of 30712205 is 50221703.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50221703 = 7 ⋅7174529.

It can be written as a sum of positive squares in 2 ways, for example, as 10118761 + 20593444 = 3181^2 + 4538^2 .

It is not a de Polignac number, because 30712205 - 2¹⁰ = 30711181 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent 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, 3071216 + ... + 3071225.

It is an arithmetic number, because the mean of its divisors is an integer number (9213663).

Almost surely, 2^30712205 is an apocalyptic number.

It is an amenable number.

30712205 is a deficient number, since it is larger than the sum of its proper divisors (6142447).

30712205 is an equidigital number, since it uses as much as digits as its factorization.

30712205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6142446.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 30712205 is about 5541.8593450213. The cubic root of 30712205 is about 313.1629191279.

Adding to 30712205 its reverse (50221703), we get a palindrome (80933908).

The spelling of 30712205 in words is "thirty million, seven hundred twelve thousand, two hundred five".