1740421 has 2 divisors, whose sum is σ = 1740422. Its totient is φ = 1740420.

The previous prime is 1740379. The next prime is 1740437. The reversal of 1740421 is 1240471.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1476225 + 264196 = 1215^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1740421 - 2⁷ = 1740293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1740451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 870210 + 870211.

It is an arithmetic number, because the mean of its divisors is an integer number (870211).

2^1740421 is an apocalyptic number.

It is an amenable number.

1740421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1740421 is an equidigital number, since it uses as much as digits as its factorization.

1740421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 1740421 is about 1319.2501658139. The cubic root of 1740421 is about 120.2868369731.

Adding to 1740421 its reverse (1240471), we get a palindrome (2980892).

The spelling of 1740421 in words is "one million, seven hundred forty thousand, four hundred twenty-one".