1921393 has 2 divisors, whose sum is σ = 1921394. Its totient is φ = 1921392.

The previous prime is 1921363. The next prime is 1921417. The reversal of 1921393 is 3931291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1361889 + 559504 = 1167^2 + 748^2 .

It is a cyclic number.

It is not a de Polignac number, because 1921393 - 2¹³ = 1913201 is a prime.

It is not a weakly prime, because it can be changed into another prime (1921363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960696 + 960697.

It is an arithmetic number, because the mean of its divisors is an integer number (960697).

2^1921393 is an apocalyptic number.

It is an amenable number.

1921393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921393 is an equidigital number, since it uses as much as digits as its factorization.

1921393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458, while the sum is 28.

The square root of 1921393 is about 1386.1432104945. The cubic root of 1921393 is about 124.3193511307.

It can be divided in two parts, 19213 and 93, that added together give a triangular number (19306 = T₁₉₆).

The spelling of 1921393 in words is "one million, nine hundred twenty-one thousand, three hundred ninety-three".