12779776 has 18 divisors (see below), whose sum is σ = 25510142. Its totient is φ = 6389760.

The previous prime is 12779713. The next prime is 12779779. The reversal of 12779776 is 67797721.

It can be written as a sum of positive squares in only one way, i.e., 12390400 + 389376 = 3520^2 + 624^2 .

It is a super-2 number, since 2×12779776² = 326645349220352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12779779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24705 + ... + 25216.

Almost surely, 2^12779776 is an apocalyptic number.

12779776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12779776 is a deficient number, since it is larger than the sum of its proper divisors (12730366).

12779776 is an frugal number, since it uses more digits than its factorization.

12779776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49937 (or 49923 counting only the distinct ones).

The product of its digits is 259308, while the sum is 46.

The square root of 12779776 is about 3574.8812567692. The cubic root of 12779776 is about 233.7981555014.

The spelling of 12779776 in words is "twelve million, seven hundred seventy-nine thousand, seven hundred seventy-six".