1280947 has 2 divisors, whose sum is σ = 1280948. Its totient is φ = 1280946.

The previous prime is 1280921. The next prime is 1280969. The reversal of 1280947 is 7490821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1280947 - 2¹¹ = 1278899 is a prime.

1280947 is a lucky number.

It is equal to p₉₈₆₇₁ and since 1280947 and 98671 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1280987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640473 + 640474.

It is an arithmetic number, because the mean of its divisors is an integer number (640474).

2^1280947 is an apocalyptic number.

1280947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280947 is an equidigital number, since it uses as much as digits as its factorization.

1280947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 1280947 is about 1131.7892913436. The cubic root of 1280947 is about 108.6034746618.

The spelling of 1280947 in words is "one million, two hundred eighty thousand, nine hundred forty-seven".