12780837 has 6 divisors (see below), whose sum is σ = 18461222. Its totient is φ = 8520552.

The previous prime is 12780827. The next prime is 12780869. The reversal of 12780837 is 73808721.

It can be written as a sum of positive squares in only one way, i.e., 6625476 + 6155361 = 2574^2 + 2481^2 .

It is not a de Polignac number, because 12780837 - 2¹⁹ = 12256549 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 (12780827) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 710038 + ... + 710055.

Almost surely, 2^12780837 is an apocalyptic number.

It is an amenable number.

12780837 is a deficient number, since it is larger than the sum of its proper divisors (5680385).

12780837 is a wasteful number, since it uses less digits than its factorization.

12780837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420099 (or 1420096 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 12780837 is about 3575.0296502267. The cubic root of 12780837 is about 233.8046254369.

The spelling of 12780837 in words is "twelve million, seven hundred eighty thousand, eight hundred thirty-seven".