1240817 has 2 divisors, whose sum is σ = 1240818. Its totient is φ = 1240816.

The previous prime is 1240807. The next prime is 1240831. The reversal of 1240817 is 7180421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1201216 + 39601 = 1096^2 + 199^2 .

It is an emirp because it is prime and its reverse (7180421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240817 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1240792 and 1240801.

It is not a weakly prime, because it can be changed into another prime (1240807) 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, 620408 + 620409.

It is an arithmetic number, because the mean of its divisors is an integer number (620409).

2^1240817 is an apocalyptic number.

It is an amenable number.

1240817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240817 is an equidigital number, since it uses as much as digits as its factorization.

1240817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 1240817 is about 1113.9196559896. The cubic root of 1240817 is about 107.4572969023.

The spelling of 1240817 in words is "one million, two hundred forty thousand, eight hundred seventeen".