1289443 has 4 divisors (see below), whose sum is σ = 1300968. Its totient is φ = 1277920.

The previous prime is 1289429. The next prime is 1289447. The reversal of 1289443 is 3449821.

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 1289443 - 2⁵ = 1289411 is a prime.

It is a Duffinian number.

1289443 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1289447) 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, 5593 + ... + 5818.

It is an arithmetic number, because the mean of its divisors is an integer number (325242).

2^1289443 is an apocalyptic number.

1289443 is a deficient number, since it is larger than the sum of its proper divisors (11525).

1289443 is a wasteful number, since it uses less digits than its factorization.

1289443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11524.

The product of its digits is 6912, while the sum is 31.

The square root of 1289443 is about 1135.5364371080. The cubic root of 1289443 is about 108.8430533096.

It can be divided in two parts, 1 and 289443, that added together give a square (289444 = 538²).

The spelling of 1289443 in words is "one million, two hundred eighty-nine thousand, four hundred forty-three".