12779538 has 16 divisors (see below), whose sum is σ = 25643520. Its totient is φ = 4245776.

The previous prime is 12779531. The next prime is 12779539. The reversal of 12779538 is 83597721.

It is a self number, because there is not a number n which added to its sum of digits gives 12779538.

It is not an unprimeable number, because it can be changed into a prime (12779531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1458 + ... + 5261.

It is an arithmetic number, because the mean of its divisors is an integer number (1602720).

Almost surely, 2^12779538 is an apocalyptic number.

12779538 is an abundant number, since it is smaller than the sum of its proper divisors (12863982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12779538 is a wasteful number, since it uses less digits than its factorization.

12779538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7041.

The product of its digits is 105840, while the sum is 42.

The square root of 12779538 is about 3574.8479687953. The cubic root of 12779538 is about 233.7967041377.

The spelling of 12779538 in words is "twelve million, seven hundred seventy-nine thousand, five hundred thirty-eight".