1965221 has 4 divisors (see below), whose sum is σ = 1969632. Its totient is φ = 1960812.

The previous prime is 1965203. The next prime is 1965239. The reversal of 1965221 is 1225691.

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.

It is an interprime number because it is at equal distance from previous prime (1965203) and next prime (1965239).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1965221 is a prime.

It is a Duffinian number.

1965221 is a Rhonda number in base 8.

It is a plaindrome in base 11.

It is a zygodrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1965521) 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, 1451 + ... + 2456.

It is an arithmetic number, because the mean of its divisors is an integer number (492408).

2^1965221 is an apocalyptic number.

It is an amenable number.

1965221 is a deficient number, since it is larger than the sum of its proper divisors (4411).

1965221 is an equidigital number, since it uses as much as digits as its factorization.

1965221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4410.

The product of its digits is 1080, while the sum is 26.

The square root of 1965221 is about 1401.8634027608. The cubic root of 1965221 is about 125.2575171152.

The spelling of 1965221 in words is "one million, nine hundred sixty-five thousand, two hundred twenty-one".