1943021 has 2 divisors, whose sum is σ = 1943022. Its totient is φ = 1943020.

The previous prime is 1942979. The next prime is 1943023. The reversal of 1943021 is 1203491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1473796 + 469225 = 1214^2 + 685^2 .

It is a cyclic number.

It is not a de Polignac number, because 1943021 - 2¹⁴ = 1926637 is a prime.

Together with 1943023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1942984 and 1943002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1943023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 971510 + 971511.

It is an arithmetic number, because the mean of its divisors is an integer number (971511).

2^1943021 is an apocalyptic number.

It is an amenable number.

1943021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1943021 is an equidigital number, since it uses as much as digits as its factorization.

1943021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1943021 is about 1393.9228816545. The cubic root of 1943021 is about 124.7840752267.

The spelling of 1943021 in words is "one million, nine hundred forty-three thousand, twenty-one".