1642843 has 2 divisors, whose sum is σ = 1642844. Its totient is φ = 1642842.

The previous prime is 1642831. The next prime is 1642847. The reversal of 1642843 is 3482461.

It is a strong prime.

It is an emirp because it is prime and its reverse (3482461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1642843 - 2⁵ = 1642811 is a prime.

It is not a weakly prime, because it can be changed into another prime (1642847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821421 + 821422.

It is an arithmetic number, because the mean of its divisors is an integer number (821422).

2^1642843 is an apocalyptic number.

1642843 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642843 is an equidigital number, since it uses as much as digits as its factorization.

1642843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 28.

The square root of 1642843 is about 1281.7343718571. The cubic root of 1642843 is about 117.9954752646.

It can be divided in two parts, 16428 and 43, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 1642843 in words is "one million, six hundred forty-two thousand, eight hundred forty-three".