1287726 has 32 divisors (see below), whose sum is σ = 2851200. Its totient is φ = 384480.

The previous prime is 1287707. The next prime is 1287731. The reversal of 1287726 is 6277821.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7105 + ... + 7283.

It is an arithmetic number, because the mean of its divisors is an integer number (89100).

2^1287726 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1287726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1425600).

1287726 is an abundant number, since it is smaller than the sum of its proper divisors (1563474).

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

1287726 is a wasteful number, since it uses less digits than its factorization.

1287726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304.

The product of its digits is 9408, while the sum is 33.

The square root of 1287726 is about 1134.7801549199. The cubic root of 1287726 is about 108.7947206745.

It can be divided in two parts, 128772 and 6, that added together give a triangular number (128778 = T₅₀₇).

The spelling of 1287726 in words is "one million, two hundred eighty-seven thousand, seven hundred twenty-six".