12780379 has 4 divisors (see below), whose sum is σ = 13532184. Its totient is φ = 12028576.

The previous prime is 12780373. The next prime is 12780409. The reversal of 12780379 is 97308721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97308721 = 31 ⋅3138991.

It is a cyclic number.

It is not a de Polignac number, because 12780379 - 2⁵ = 12780347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12780373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375877 + ... + 375910.

It is an arithmetic number, because the mean of its divisors is an integer number (3383046).

Almost surely, 2^12780379 is an apocalyptic number.

12780379 is a deficient number, since it is larger than the sum of its proper divisors (751805).

12780379 is an equidigital number, since it uses as much as digits as its factorization.

12780379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751804.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 12780379 is about 3574.9655942400. The cubic root of 12780379 is about 233.8018326151.

The spelling of 12780379 in words is "twelve million, seven hundred eighty thousand, three hundred seventy-nine".