1921396 has 6 divisors (see below), whose sum is σ = 3362450. Its totient is φ = 960696.

The previous prime is 1921393. The next prime is 1921417. The reversal of 1921396 is 6931291.

It can be written as a sum of positive squares in only one way, i.e., 1920996 + 400 = 1386^2 + 20^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921393) 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, 240171 + ... + 240178.

2^1921396 is an apocalyptic number.

It is an amenable number.

1921396 is a deficient number, since it is larger than the sum of its proper divisors (1441054).

1921396 is a wasteful number, since it uses less digits than its factorization.

1921396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480353 (or 480351 counting only the distinct ones).

The product of its digits is 2916, while the sum is 31.

The square root of 1921396 is about 1386.1442926333. The cubic root of 1921396 is about 124.3194158334.

The spelling of 1921396 in words is "one million, nine hundred twenty-one thousand, three hundred ninety-six".