1742021 has 2 divisors, whose sum is σ = 1742022. Its totient is φ = 1742020.

The previous prime is 1742017. The next prime is 1742033. The reversal of 1742021 is 1202471.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1716100 + 25921 = 1310^2 + 161^2 .

It is an emirp because it is prime and its reverse (1202471) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1742021 - 2² = 1742017 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p₁₃₁₀₃₉ and since 1742021 and 131039 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1742051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 871010 + 871011.

It is an arithmetic number, because the mean of its divisors is an integer number (871011).

2^1742021 is an apocalyptic number.

It is an amenable number.

1742021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1742021 is an equidigital number, since it uses as much as digits as its factorization.

1742021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 1742021 is about 1319.8564315864. The cubic root of 1742021 is about 120.3236862933.

Adding to 1742021 its reverse (1202471), we get a palindrome (2944492).

The spelling of 1742021 in words is "one million, seven hundred forty-two thousand, twenty-one".