1921105 has 8 divisors (see below), whose sum is σ = 2385000. Its totient is φ = 1483776.

The previous prime is 1921103. The next prime is 1921123. The reversal of 1921105 is 5011291.

It can be written as a sum of positive squares in 4 ways, for example, as 82369 + 1838736 = 287^2 + 1356^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1921105 - 2¹ = 1921103 is a prime.

1921105 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1921103) 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, 6480 + ... + 6769.

It is an arithmetic number, because the mean of its divisors is an integer number (298125).

2^1921105 is an apocalyptic number.

It is an amenable number.

1921105 is a deficient number, since it is larger than the sum of its proper divisors (463895).

1921105 is a wasteful number, since it uses less digits than its factorization.

1921105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13283.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 1921105 is about 1386.0393212315. The cubic root of 1921105 is about 124.3131393593.

Adding to 1921105 its reverse (5011291), we get a palindrome (6932396).

The spelling of 1921105 in words is "one million, nine hundred twenty-one thousand, one hundred five".