1642243 has 2 divisors, whose sum is σ = 1642244. Its totient is φ = 1642242.

The previous prime is 1642231. The next prime is 1642247. The reversal of 1642243 is 3422461.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1642243 - 2⁵ = 1642211 is a prime.

It is the 1282-nd Hogben number.

It is equal to p₁₂₄₀₈₇ and since 1642243 and 124087 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (1642247) by changing a digit.

It is a nontrivial repunit in base 1281.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821121 + 821122.

It is an arithmetic number, because the mean of its divisors is an integer number (821122).

2^1642243 is an apocalyptic number.

1642243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642243 is an equidigital number, since it uses as much as digits as its factorization.

1642243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 22.

The square root of 1642243 is about 1281.5002926258. The cubic root of 1642243 is about 117.9811087252.

The spelling of 1642243 in words is "one million, six hundred forty-two thousand, two hundred forty-three".