1240535553 has 8 divisors (see below), whose sum is σ = 1662360000. Its totient is φ = 822867408.

The previous prime is 1240535551. The next prime is 1240535557. The reversal of 1240535553 is 3555350421.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1240535553 - 2¹ = 1240535551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1240535551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1038378 + ... + 1039571.

It is an arithmetic number, because the mean of its divisors is an integer number (207795000).

Almost surely, 2^1240535553 is an apocalyptic number.

It is an amenable number.

1240535553 is a deficient number, since it is larger than the sum of its proper divisors (421824447).

1240535553 is a wasteful number, since it uses less digits than its factorization.

1240535553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2078151.

The product of its (nonzero) digits is 45000, while the sum is 33.

The square root of 1240535553 is about 35221.2372440265. The cubic root of 1240535553 is about 1074.4917165880.

Adding to 1240535553 its reverse (3555350421), we get a palindrome (4795885974).

The spelling of 1240535553 in words is "one billion, two hundred forty million, five hundred thirty-five thousand, five hundred fifty-three".