1978268 has 6 divisors (see below), whose sum is σ = 3461976. Its totient is φ = 989132.

The previous prime is 1978267. The next prime is 1978289. The reversal of 1978268 is 8628791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247280 + ... + 247287.

It is an arithmetic number, because the mean of its divisors is an integer number (576996).

2^1978268 is an apocalyptic number.

It is an amenable number.

1978268 is a deficient number, since it is larger than the sum of its proper divisors (1483708).

1978268 is a wasteful number, since it uses less digits than its factorization.

1978268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494571 (or 494569 counting only the distinct ones).

The product of its digits is 48384, while the sum is 41.

The square root of 1978268 is about 1406.5091538984. The cubic root of 1978268 is about 125.5340986587.

It can be divided in two parts, 19 and 78268, that added together give a palindrome (78287).

The spelling of 1978268 in words is "one million, nine hundred seventy-eight thousand, two hundred sixty-eight".