1921093 has 4 divisors (see below), whose sum is σ = 1925100. Its totient is φ = 1917088.

The previous prime is 1921079. The next prime is 1921097. The reversal of 1921093 is 3901291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3901291 = 617 ⋅6323.

It can be written as a sum of positive squares in 2 ways, for example, as 66049 + 1855044 = 257^2 + 1362^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1921093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921097) 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, 1168 + ... + 2281.

It is an arithmetic number, because the mean of its divisors is an integer number (481275).

2^1921093 is an apocalyptic number.

It is an amenable number.

1921093 is a deficient number, since it is larger than the sum of its proper divisors (4007).

1921093 is an equidigital number, since it uses as much as digits as its factorization.

1921093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4006.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 1921093 is about 1386.0349923433. The cubic root of 1921093 is about 124.3128805220.

It can be divided in two parts, 19 and 21093, that added together give a palindrome (21112).

The spelling of 1921093 in words is "one million, nine hundred twenty-one thousand, ninety-three".