1240553 has 2 divisors, whose sum is σ = 1240554. Its totient is φ = 1240552.

The previous prime is 1240543. The next prime is 1240559. The reversal of 1240553 is 3550421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 795664 + 444889 = 892^2 + 667^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240553 - 2¹⁰ = 1239529 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1240559) 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, 620276 + 620277.

It is an arithmetic number, because the mean of its divisors is an integer number (620277).

2^1240553 is an apocalyptic number.

It is an amenable number.

1240553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240553 is an equidigital number, since it uses as much as digits as its factorization.

1240553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 1240553 is about 1113.8011492183. The cubic root of 1240553 is about 107.4496753813.

Adding to 1240553 its reverse (3550421), we get a palindrome (4790974).

The spelling of 1240553 in words is "one million, two hundred forty thousand, five hundred fifty-three".