1263321 has 24 divisors (see below), whose sum is σ = 2021760. Its totient is φ = 756096.

The previous prime is 1263319. The next prime is 1263323. The reversal of 1263321 is 1233621.

1263321 is a `hidden beast` number, since 12 + 633 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (1263319) and next prime (1263323).

It is not a de Polignac number, because 1263321 - 2¹ = 1263319 is a prime.

1263321 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1263294 and 1263303.

It is not an unprimeable number, because it can be changed into a prime (1263323) 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, 3340 + ... + 3698.

It is an arithmetic number, because the mean of its divisors is an integer number (84240).

2^1263321 is an apocalyptic number.

It is an amenable number.

1263321 is a deficient number, since it is larger than the sum of its proper divisors (758439).

1263321 is a wasteful number, since it uses less digits than its factorization.

1263321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405 (or 402 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 1263321 is about 1123.9755335415. The cubic root of 1263321 is about 108.1030395219.

Adding to 1263321 its reverse (1233621), we get a palindrome (2496942).

The spelling of 1263321 in words is "one million, two hundred sixty-three thousand, three hundred twenty-one".