12780238 has 4 divisors (see below), whose sum is σ = 19170360. Its totient is φ = 6390118.

The previous prime is 12780223. The next prime is 12780247. The reversal of 12780238 is 83208721.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×12780238³ (a number of 22 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3195058 + ... + 3195061.

It is an arithmetic number, because the mean of its divisors is an integer number (4792590).

Almost surely, 2^12780238 is an apocalyptic number.

12780238 is a deficient number, since it is larger than the sum of its proper divisors (6390122).

12780238 is an equidigital number, since it uses as much as digits as its factorization.

12780238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6390121.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 12780238 is about 3574.9458737161. The cubic root of 12780238 is about 233.8009728029.

Adding to 12780238 its reverse (83208721), we get a palindrome (95988959).

The spelling of 12780238 in words is "twelve million, seven hundred eighty thousand, two hundred thirty-eight".