12813778 has 8 divisors (see below), whose sum is σ = 19248768. Its totient is φ = 6397524.

The previous prime is 12813761. The next prime is 12813791. The reversal of 12813778 is 87731821.

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

It is an unprimeable number.

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, 2826 + ... + 5797.

It is an arithmetic number, because the mean of its divisors is an integer number (2406096).

Almost surely, 2^12813778 is an apocalyptic number.

12813778 is a deficient number, since it is larger than the sum of its proper divisors (6434990).

12813778 is an equidigital number, since it uses as much as digits as its factorization.

12813778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9368.

The product of its digits is 18816, while the sum is 37.

The square root of 12813778 is about 3579.6337801513. The cubic root of 12813778 is about 234.0053204527.

It can be divided in two parts, 128 and 13778, that multiplied together give a square (1763584 = 1328²).

The spelling of 12813778 in words is "twelve million, eight hundred thirteen thousand, seven hundred seventy-eight".