1240280455709 has 2 divisors, whose sum is σ = 1240280455710. Its totient is φ = 1240280455708.

The previous prime is 1240280455679. The next prime is 1240280455741. The reversal of 1240280455709 is 9075540820421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1146676888900 + 93603566809 = 1070830^2 + 305947^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240280455709 - 2²⁸ = 1240012020253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240280455759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620140227854 + 620140227855.

It is an arithmetic number, because the mean of its divisors is an integer number (620140227855).

Almost surely, 2^{1240280455709} is an apocalyptic number.

It is an amenable number.

1240280455709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240280455709 is an equidigital number, since it uses as much as digits as its factorization.

1240280455709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 806400, while the sum is 47.

The spelling of 1240280455709 in words is "one trillion, two hundred forty billion, two hundred eighty million, four hundred fifty-five thousand, seven hundred nine".