1942021 has 2 divisors, whose sum is σ = 1942022. Its totient is φ = 1942020.

The previous prime is 1942007. The next prime is 1942027. The reversal of 1942021 is 1202491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1920996 + 21025 = 1386^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 1942021 - 2⁹ = 1941509 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1942021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1942027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 971010 + 971011.

It is an arithmetic number, because the mean of its divisors is an integer number (971011).

2^1942021 is an apocalyptic number.

It is an amenable number.

1942021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1942021 is an equidigital number, since it uses as much as digits as its factorization.

1942021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1942021 is about 1393.5641355890. The cubic root of 1942021 is about 124.7626643261.

The spelling of 1942021 in words is "one million, nine hundred forty-two thousand, twenty-one".