1240523 has 2 divisors, whose sum is σ = 1240524. Its totient is φ = 1240522.

The previous prime is 1240517. The next prime is 1240543. The reversal of 1240523 is 3250421.

It is a weak prime.

It is an emirp because it is prime and its reverse (3250421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1240523 - 2¹⁰ = 1239499 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1240543) 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, 620261 + 620262.

It is an arithmetic number, because the mean of its divisors is an integer number (620262).

2^1240523 is an apocalyptic number.

1240523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240523 is an equidigital number, since it uses as much as digits as its factorization.

1240523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 1240523 is about 1113.7876817419. The cubic root of 1240523 is about 107.4488092309.

Adding to 1240523 its reverse (3250421), we get a palindrome (4490944).

The spelling of 1240523 in words is "one million, two hundred forty thousand, five hundred twenty-three".