1289862 has 48 divisors (see below), whose sum is σ = 3313440. Its totient is φ = 354816.

The previous prime is 1289851. The next prime is 1289867. The reversal of 1289862 is 2689821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3478 + ... + 3830.

It is an arithmetic number, because the mean of its divisors is an integer number (69030).

2^1289862 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1289862, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1656720).

1289862 is an abundant number, since it is smaller than the sum of its proper divisors (2023578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1289862 is a wasteful number, since it uses less digits than its factorization.

1289862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397 (or 394 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 1289862 is about 1135.7209164227. The cubic root of 1289862 is about 108.8548414229.

The spelling of 1289862 in words is "one million, two hundred eighty-nine thousand, eight hundred sixty-two".