12779649 has 6 divisors (see below), whose sum is σ = 18459506. Its totient is φ = 8519760.

The previous prime is 12779639. The next prime is 12779671. The reversal of 12779649 is 94697721.

It can be written as a sum of positive squares in only one way, i.e., 7290000 + 5489649 = 2700^2 + 2343^2 .

It is not a de Polignac number, because 12779649 - 2¹³ = 12771457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12779639) 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, 709972 + ... + 709989.

Almost surely, 2^12779649 is an apocalyptic number.

It is an amenable number.

12779649 is a deficient number, since it is larger than the sum of its proper divisors (5679857).

12779649 is a wasteful number, since it uses less digits than its factorization.

12779649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419967 (or 1419964 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 12779649 is about 3574.8634938974. The cubic root of 12779649 is about 233.7973810365.

The spelling of 12779649 in words is "twelve million, seven hundred seventy-nine thousand, six hundred forty-nine".