30208813 has 4 divisors (see below), whose sum is σ = 31985820. Its totient is φ = 28431808.

The previous prime is 30208811. The next prime is 30208819. The reversal of 30208813 is 31880203.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31880203 = 241 ⋅132283.

It can be written as a sum of positive squares in 2 ways, for example, as 28323684 + 1885129 = 5322^2 + 1373^2 .

It is a cyclic number.

It is not a de Polignac number, because 30208813 - 2¹ = 30208811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30208811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 888478 + ... + 888511.

It is an arithmetic number, because the mean of its divisors is an integer number (7996455).

Almost surely, 2^30208813 is an apocalyptic number.

It is an amenable number.

30208813 is a deficient number, since it is larger than the sum of its proper divisors (1777007).

30208813 is a wasteful number, since it uses less digits than its factorization.

30208813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777006.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 30208813 is about 5496.2544518972. The cubic root of 30208813 is about 311.4425072120.

The spelling of 30208813 in words is "thirty million, two hundred eight thousand, eight hundred thirteen".