1921441 has 4 divisors (see below), whose sum is σ = 1924884. Its totient is φ = 1918000.

The previous prime is 1921427. The next prime is 1921457. The reversal of 1921441 is 1441291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1441291 = 139 ⋅10369.

It can be written as a sum of positive squares in 2 ways, for example, as 1147041 + 774400 = 1071^2 + 880^2 .

It is a cyclic number.

It is not a de Polignac number, because 1921441 - 2¹⁵ = 1888673 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1921481) 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, 670 + ... + 2071.

It is an arithmetic number, because the mean of its divisors is an integer number (481221).

2^1921441 is an apocalyptic number.

It is an amenable number.

1921441 is a deficient number, since it is larger than the sum of its proper divisors (3443).

1921441 is an equidigital number, since it uses as much as digits as its factorization.

1921441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3442.

The product of its digits is 288, while the sum is 22.

The square root of 1921441 is about 1386.1605246147. The cubic root of 1921441 is about 124.3203863656.

It can be divided in two parts, 192 and 1441, that multiplied together give a palindrome (276672).

The spelling of 1921441 in words is "one million, nine hundred twenty-one thousand, four hundred forty-one".