12842778 has 32 divisors (see below), whose sum is σ = 27820800. Its totient is φ = 3928896.

The previous prime is 12842777. The next prime is 12842779. The reversal of 12842778 is 87724821.

It is an interprime number because it is at equal distance from previous prime (12842777) and next prime (12842779).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is not an unprimeable number, because it can be changed into a prime (12842771) 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, 17503 + ... + 18221.

It is an arithmetic number, because the mean of its divisors is an integer number (869400).

Almost surely, 2^12842778 is an apocalyptic number.

12842778 is an abundant number, since it is smaller than the sum of its proper divisors (14978022).

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

12842778 is a wasteful number, since it uses less digits than its factorization.

12842778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966.

The product of its digits is 50176, while the sum is 39.

The square root of 12842778 is about 3583.6821845694. The cubic root of 12842778 is about 234.1817201914.

The spelling of 12842778 in words is "twelve million, eight hundred forty-two thousand, seven hundred seventy-eight".