1243135345440 has 48 divisors (see below), whose sum is σ = 3915876339648. Its totient is φ = 331502758656.

The previous prime is 1243135345427. The next prime is 1243135345477. The reversal of 1243135345440 is 445435313421.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1294932172 + ... + 1294933131.

It is an arithmetic number, because the mean of its divisors is an integer number (81580757076).

Almost surely, 2^{1243135345440} is an apocalyptic number.

1243135345440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243135345440 is an abundant number, since it is smaller than the sum of its proper divisors (2672740994208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1243135345440 is a wasteful number, since it uses less digits than its factorization.

1243135345440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2589865321 (or 2589865313 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 39.

The spelling of 1243135345440 in words is "one trillion, two hundred forty-three billion, one hundred thirty-five million, three hundred forty-five thousand, four hundred forty".