30800249 has 4 divisors (see below), whose sum is σ = 30828660. Its totient is φ = 30771840.

The previous prime is 30800219. The next prime is 30800251. The reversal of 30800249 is 94200803.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94200803 = 19 ⋅4957937.

It can be written as a sum of positive squares in 2 ways, for example, as 12250000 + 18550249 = 3500^2 + 4307^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30800249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30800219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12512 + ... + 14769.

It is an arithmetic number, because the mean of its divisors is an integer number (7707165).

Almost surely, 2^30800249 is an apocalyptic number.

It is an amenable number.

30800249 is a deficient number, since it is larger than the sum of its proper divisors (28411).

30800249 is a wasteful number, since it uses less digits than its factorization.

30800249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28410.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 30800249 is about 5549.7972035021. The cubic root of 30800249 is about 313.4618861623.

The spelling of 30800249 in words is "thirty million, eight hundred thousand, two hundred forty-nine".