12779715 has 16 divisors (see below), whose sum is σ = 22020768. Its totient is φ = 6291456.

The previous prime is 12779713. The next prime is 12779779. The reversal of 12779715 is 51797721.

12779715 is nontrivially palindromic in base 2 and base 4.

It is not a de Polignac number, because 12779715 - 2¹ = 12779713 is a prime.

It is a super-2 number, since 2×12779715² = 326642230962450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (12779713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32574 + ... + 32963.

It is an arithmetic number, because the mean of its divisors is an integer number (1376298).

Almost surely, 2^12779715 is an apocalyptic number.

12779715 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12779715 is a deficient number, since it is larger than the sum of its proper divisors (9241053).

12779715 is a wasteful number, since it uses less digits than its factorization.

12779715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65558.

The product of its digits is 30870, while the sum is 39.

The square root of 12779715 is about 3574.8727250071. The cubic root of 12779715 is about 233.7977835149.

The spelling of 12779715 in words is "twelve million, seven hundred seventy-nine thousand, seven hundred fifteen".