12967778 has 4 divisors (see below), whose sum is σ = 19451670. Its totient is φ = 6483888.

The previous prime is 12967769. The next prime is 12967789. The reversal of 12967778 is 87776921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10738729 + 2229049 = 3277^2 + 1493^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3241943 + ... + 3241946.

Almost surely, 2^12967778 is an apocalyptic number.

12967778 is a deficient number, since it is larger than the sum of its proper divisors (6483892).

12967778 is an equidigital number, since it uses as much as digits as its factorization.

12967778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6483891.

The product of its digits is 296352, while the sum is 47.

The square root of 12967778 is about 3601.0801157431. The cubic root of 12967778 is about 234.9390395674.

The spelling of 12967778 in words is "twelve million, nine hundred sixty-seven thousand, seven hundred seventy-eight".