1289947 has 4 divisors (see below), whose sum is σ = 1293120. Its totient is φ = 1286776.

The previous prime is 1289933. The next prime is 1289963. The reversal of 1289947 is 7499821.

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

It is a cyclic number.

It is not a de Polignac number, because 1289947 - 2¹¹ = 1287899 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

1289947 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1289927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 868 + ... + 1825.

It is an arithmetic number, because the mean of its divisors is an integer number (323280).

2^1289947 is an apocalyptic number.

1289947 is a deficient number, since it is larger than the sum of its proper divisors (3173).

1289947 is an equidigital number, since it uses as much as digits as its factorization.

1289947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3172.

The product of its digits is 36288, while the sum is 40.

The square root of 1289947 is about 1135.7583369714. The cubic root of 1289947 is about 108.8572324948.

The spelling of 1289947 in words is "one million, two hundred eighty-nine thousand, nine hundred forty-seven".