1267978 has 8 divisors (see below), whose sum is σ = 1911168. Its totient is φ = 630924.

The previous prime is 1267961. The next prime is 1267999. The reversal of 1267978 is 8797621.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1267978.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 976 + ... + 1867.

It is an arithmetic number, because the mean of its divisors is an integer number (238896).

2^1267978 is an apocalyptic number.

1267978 is a deficient number, since it is larger than the sum of its proper divisors (643190).

1267978 is a wasteful number, since it uses less digits than its factorization.

1267978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3068.

The product of its digits is 42336, while the sum is 40.

The square root of 1267978 is about 1126.0452921619. The cubic root of 1267978 is about 108.2357106090.

The spelling of 1267978 in words is "one million, two hundred sixty-seven thousand, nine hundred seventy-eight".