12780322 has 4 divisors (see below), whose sum is σ = 19170486. Its totient is φ = 6390160.

The previous prime is 12780307. The next prime is 12780323. The reversal of 12780322 is 22308721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22308721 = 1171 ⋅19051.

It can be written as a sum of positive squares in only one way, i.e., 10817521 + 1962801 = 3289^2 + 1401^2 .

It is not an unprimeable number, because it can be changed into a prime (12780323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3195079 + ... + 3195082.

Almost surely, 2^12780322 is an apocalyptic number.

12780322 is a deficient number, since it is larger than the sum of its proper divisors (6390164).

12780322 is an equidigital number, since it uses as much as digits as its factorization.

12780322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6390163.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 12780322 is about 3574.9576221264. The cubic root of 12780322 is about 233.8014850322.

The spelling of 12780322 in words is "twelve million, seven hundred eighty thousand, three hundred twenty-two".