12787209 has 12 divisors (see below), whose sum is σ = 19442800. Its totient is φ = 8076024.

The previous prime is 12787207. The next prime is 12787267. The reversal of 12787209 is 90278721.

It is not a de Polignac number, because 12787209 - 2¹ = 12787207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12787207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37219 + ... + 37560.

Almost surely, 2^12787209 is an apocalyptic number.

12787209 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12787209 is a deficient number, since it is larger than the sum of its proper divisors (6655591).

12787209 is a wasteful number, since it uses less digits than its factorization.

12787209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74804 (or 74801 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 12787209 is about 3575.9207205977. The cubic root of 12787209 is about 233.8434741069.

It can be divided in two parts, 12787 and 209, that added together give a square (12996 = 114²).

The spelling of 12787209 in words is "twelve million, seven hundred eighty-seven thousand, two hundred nine".