1021306 has 16 divisors (see below), whose sum is σ = 1800288. Its totient is φ = 428400.

The previous prime is 1021303. The next prime is 1021327. The reversal of 1021306 is 6031201.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (1021301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1500 + ... + 2071.

It is an arithmetic number, because the mean of its divisors is an integer number (112518).

2^1021306 is an apocalyptic number.

1021306 is a deficient number, since it is larger than the sum of its proper divisors (778982).

1021306 is a wasteful number, since it uses less digits than its factorization.

1021306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3597.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1021306 is about 1010.5968533495. The cubic root of 1021306 is about 100.7052150269.

Adding to 1021306 its reverse (6031201), we get a palindrome (7052507).

It can be divided in two parts, 10 and 21306, that added together give a square (21316 = 146²).

The spelling of 1021306 in words is "one million, twenty-one thousand, three hundred six".