12681765 has 40 divisors (see below), whose sum is σ = 22990968. Its totient is φ = 6687360.

The previous prime is 12681743. The next prime is 12681769. The reversal of 12681765 is 56718621.

It can be written as a sum of positive squares in 4 ways, for example, as 613089 + 12068676 = 783^2 + 3474^2 .

It is not a de Polignac number, because 12681765 - 2⁸ = 12681509 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12681769) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 69975 + ... + 70155.

Almost surely, 2^12681765 is an apocalyptic number.

12681765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12681765 is a deficient number, since it is larger than the sum of its proper divisors (10309203).

12681765 is a wasteful number, since it uses less digits than its factorization.

12681765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371 (or 362 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 12681765 is about 3561.1465850201. The cubic root of 12681765 is about 233.1989373443.

The spelling of 12681765 in words is "twelve million, six hundred eighty-one thousand, seven hundred sixty-five".