1240405343523 has 16 divisors (see below), whose sum is σ = 1837659844000. Its totient is φ = 826926861600.

The previous prime is 1240405343503. The next prime is 1240405343531. The reversal of 1240405343523 is 3253435040421.

1240405343523 is a `hidden beast` number, since 1 + 2 + 4 + 0 + 40 + 53 + 43 + 523 = 666.

It is not a de Polignac number, because 1240405343523 - 2⁸ = 1240405343267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240405343503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2486373 + ... + 2943273.

It is an arithmetic number, because the mean of its divisors is an integer number (114853740250).

Almost surely, 2^{1240405343523} is an apocalyptic number.

1240405343523 is a deficient number, since it is larger than the sum of its proper divisors (597254500477).

1240405343523 is a wasteful number, since it uses less digits than its factorization.

1240405343523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557459 (or 557453 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 36.

The spelling of 1240405343523 in words is "one trillion, two hundred forty billion, four hundred five million, three hundred forty-three thousand, five hundred twenty-three".