12779557 has 8 divisors (see below), whose sum is σ = 14945216. Its totient is φ = 10698912.

The previous prime is 12779539. The next prime is 12779567. The reversal of 12779557 is 75597721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12779557 - 2¹¹ = 12777509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12779567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20928 + ... + 21529.

It is an arithmetic number, because the mean of its divisors is an integer number (1868152).

Almost surely, 2^12779557 is an apocalyptic number.

It is an amenable number.

12779557 is a deficient number, since it is larger than the sum of its proper divisors (2165659).

12779557 is an equidigital number, since it uses as much as digits as its factorization.

12779557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42507.

The product of its digits is 154350, while the sum is 43.

The square root of 12779557 is about 3574.8506262500. The cubic root of 12779557 is about 233.7968200036.

The spelling of 12779557 in words is "twelve million, seven hundred seventy-nine thousand, five hundred fifty-seven".