12979765 has 16 divisors (see below), whose sum is σ = 16175808. Its totient is φ = 9991296.

The previous prime is 12979727. The next prime is 12979777. The reversal of 12979765 is 56797921.

It is a happy number.

It is a 4-Lehmer number, since φ(12979765) divides (12979765-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 12979765 - 2¹¹ = 12977717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15282 + ... + 16108.

It is an arithmetic number, because the mean of its divisors is an integer number (1010988).

It is a Poulet number, since it divides 2^12979764-1.

Almost surely, 2^12979765 is an apocalyptic number.

It is an amenable number.

12979765 is a deficient number, since it is larger than the sum of its proper divisors (3196043).

12979765 is an equidigital number, since it uses as much as digits as its factorization.

12979765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948.

The product of its digits is 238140, while the sum is 46.

The square root of 12979765 is about 3602.7440930491. The cubic root of 12979765 is about 235.0114073231.

The spelling of 12979765 in words is "twelve million, nine hundred seventy-nine thousand, seven hundred sixty-five".