1921373 has 4 divisors (see below), whose sum is σ = 1973340. Its totient is φ = 1869408.

The previous prime is 1921363. The next prime is 1921393. The reversal of 1921373 is 3731291.

1921373 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3731291 = 347 ⋅10753.

It can be written as a sum of positive squares in 2 ways, for example, as 1800964 + 120409 = 1342^2 + 347^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1921373 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921363) 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, 25928 + ... + 26001.

It is an arithmetic number, because the mean of its divisors is an integer number (493335).

2^1921373 is an apocalyptic number.

It is an amenable number.

1921373 is a deficient number, since it is larger than the sum of its proper divisors (51967).

1921373 is an equidigital number, since it uses as much as digits as its factorization.

1921373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51966.

The product of its digits is 1134, while the sum is 26.

The square root of 1921373 is about 1386.1359962139. The cubic root of 1921373 is about 124.3189197777.

The spelling of 1921373 in words is "one million, nine hundred twenty-one thousand, three hundred seventy-three".