1243859 has 2 divisors, whose sum is σ = 1243860. Its totient is φ = 1243858.

The previous prime is 1243843. The next prime is 1243877. The reversal of 1243859 is 9583421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1243859 - 2⁴ = 1243843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1243819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621929 + 621930.

It is an arithmetic number, because the mean of its divisors is an integer number (621930).

2^1243859 is an apocalyptic number.

1243859 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243859 is an equidigital number, since it uses as much as digits as its factorization.

1243859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 1243859 is about 1115.2842686957. The cubic root of 1243859 is about 107.5450397171.

The spelling of 1243859 in words is "one million, two hundred forty-three thousand, eight hundred fifty-nine".