30780243 has 20 divisors (see below), whose sum is σ = 49519008. Its totient is φ = 18941040.

The previous prime is 30780229. The next prime is 30780257. The reversal of 30780243 is 34208703.

It is an interprime number because it is at equal distance from previous prime (30780229) and next prime (30780257).

It is not a de Polignac number, because 30780243 - 2¹⁸ = 30518099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (30780203) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13563 + ... + 15668.

Almost surely, 2^30780243 is an apocalyptic number.

30780243 is a deficient number, since it is larger than the sum of its proper divisors (18738765).

30780243 is a wasteful number, since it uses less digits than its factorization.

30780243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29256 (or 29247 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 30780243 is about 5547.9945025207. The cubic root of 30780243 is about 313.3940027634.

Adding to 30780243 its reverse (34208703), we get a palindrome (64988946).

The spelling of 30780243 in words is "thirty million, seven hundred eighty thousand, two hundred forty-three".