1289487 has 8 divisors (see below), whose sum is σ = 1765936. Its totient is φ = 836352.

The previous prime is 1289459. The next prime is 1289513. The reversal of 1289487 is 7849821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1289487 - 2⁶ = 1289423 is a prime.

It is an Ulam number.

1289487 is a lucky number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 5698 + ... + 5919.

It is an arithmetic number, because the mean of its divisors is an integer number (220742).

2^1289487 is an apocalyptic number.

1289487 is a deficient number, since it is larger than the sum of its proper divisors (476449).

1289487 is a wasteful number, since it uses less digits than its factorization.

1289487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11657.

The product of its digits is 32256, while the sum is 39.

The square root of 1289487 is about 1135.5558110459. Note that the first 3 decimals coincide. The cubic root of 1289487 is about 108.8442913222.

The spelling of 1289487 in words is "one million, two hundred eighty-nine thousand, four hundred eighty-seven".