1306221 has 8 divisors (see below), whose sum is σ = 1990464. Its totient is φ = 746400.

The previous prime is 1306213. The next prime is 1306223. The reversal of 1306221 is 1226031.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1306221 - 2³ = 1306213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1306221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31080 + ... + 31121.

It is an arithmetic number, because the mean of its divisors is an integer number (248808).

2^1306221 is an apocalyptic number.

It is an amenable number.

1306221 is a deficient number, since it is larger than the sum of its proper divisors (684243).

1306221 is an equidigital number, since it uses as much as digits as its factorization.

1306221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62211.

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

The square root of 1306221 is about 1142.9002581153. The cubic root of 1306221 is about 109.3131025014.

The spelling of 1306221 in words is "one million, three hundred six thousand, two hundred twenty-one".