1206321 has 4 divisors (see below), whose sum is σ = 1608432. Its totient is φ = 804212.

The previous prime is 1206319. The next prime is 1206323. The reversal of 1206321 is 1236021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1236021 = 3 ⋅412007.

It is an interprime number because it is at equal distance from previous prime (1206319) and next prime (1206323).

It is a cyclic number.

It is not a de Polignac number, because 1206321 - 2¹ = 1206319 is a prime.

It is a D-number.

It is a Curzon number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 1206321.

It is not an unprimeable number, because it can be changed into a prime (1206323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201051 + ... + 201056.

It is an arithmetic number, because the mean of its divisors is an integer number (402108).

2^1206321 is an apocalyptic number.

It is an amenable number.

1206321 is a deficient number, since it is larger than the sum of its proper divisors (402111).

1206321 is an equidigital number, since it uses as much as digits as its factorization.

1206321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402110.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1206321 is about 1098.3264542020. The cubic root of 1206321 is about 106.4521153950.

It can be divided in two parts, 120 and 6321, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 1206321 in words is "one million, two hundred six thousand, three hundred twenty-one".