1240535557 has 2 divisors, whose sum is σ = 1240535558. Its totient is φ = 1240535556.

The previous prime is 1240535551. The next prime is 1240535573. The reversal of 1240535557 is 7555350421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1183291201 + 57244356 = 34399^2 + 7566^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240535557 - 2¹¹ = 1240533509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240535551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620267778 + 620267779.

It is an arithmetic number, because the mean of its divisors is an integer number (620267779).

Almost surely, 2^1240535557 is an apocalyptic number.

It is an amenable number.

1240535557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240535557 is an equidigital number, since it uses as much as digits as its factorization.

1240535557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105000, while the sum is 37.

The square root of 1240535557 is about 35221.2373008104. The cubic root of 1240535557 is about 1074.4917177429.

Adding to 1240535557 its reverse (7555350421), we get a palindrome (8795885978).

The spelling of 1240535557 in words is "one billion, two hundred forty million, five hundred thirty-five thousand, five hundred fifty-seven".