1978267 has 2 divisors, whose sum is σ = 1978268. Its totient is φ = 1978266.

The previous prime is 1978219. The next prime is 1978289. The reversal of 1978267 is 7628791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1978267 - 2¹⁵ = 1945499 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1978297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989133 + 989134.

It is an arithmetic number, because the mean of its divisors is an integer number (989134).

2^1978267 is an apocalyptic number.

1978267 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978267 is an equidigital number, since it uses as much as digits as its factorization.

1978267 is an evil number, because the sum of its binary digits is even.

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

The square root of 1978267 is about 1406.5087984083. The cubic root of 1978267 is about 125.5340775065.

It can be divided in two parts, 197 and 8267, that added together give a square (8464 = 92²).

The spelling of 1978267 in words is "one million, nine hundred seventy-eight thousand, two hundred sixty-seven".