1286730 has 72 divisors (see below), whose sum is σ = 3668652. Its totient is φ = 311808.

The previous prime is 1286711. The next prime is 1286773. The reversal of 1286730 is 376821.

It can be written as a sum of positive squares in 6 ways, for example, as 772641 + 514089 = 879^2 + 717^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1286694 and 1286703.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 44356 + ... + 44384.

2^1286730 is an apocalyptic number.

1286730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1286730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1834326).

1286730 is an abundant number, since it is smaller than the sum of its proper divisors (2381922).

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

1286730 is a wasteful number, since it uses less digits than its factorization.

1286730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 56 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 1286730 is about 1134.3412185053. The cubic root of 1286730 is about 108.7666641130.

Subtracting from 1286730 its reverse (376821), we obtain a palindrome (909909).

It can be divided in two parts, 1286 and 730, that added together give a triangular number (2016 = T₆₃).

The spelling of 1286730 in words is "one million, two hundred eighty-six thousand, seven hundred thirty".