1642741 has 2 divisors, whose sum is σ = 1642742. Its totient is φ = 1642740.

The previous prime is 1642723. The next prime is 1642769. The reversal of 1642741 is 1472461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1572516 + 70225 = 1254^2 + 265^2 .

It is an emirp because it is prime and its reverse (1472461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1642741 - 2⁵ = 1642709 is a prime.

1642741 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1642141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821370 + 821371.

It is an arithmetic number, because the mean of its divisors is an integer number (821371).

2^1642741 is an apocalyptic number.

It is an amenable number.

1642741 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642741 is an equidigital number, since it uses as much as digits as its factorization.

1642741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 25.

The square root of 1642741 is about 1281.6945814039. The cubic root of 1642741 is about 117.9930331997.

The spelling of 1642741 in words is "one million, six hundred forty-two thousand, seven hundred forty-one".