1283555440 has 20 divisors (see below), whose sum is σ = 2984266584. Its totient is φ = 513422144.

The previous prime is 1283555407. The next prime is 1283555447. The reversal of 1283555440 is 445553821.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 1283555440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1283555447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8022142 + ... + 8022301.

Almost surely, 2^1283555440 is an apocalyptic number.

1283555440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1283555440 is an abundant number, since it is smaller than the sum of its proper divisors (1700711144).

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

1283555440 is a wasteful number, since it uses less digits than its factorization.

1283555440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16044456 (or 16044450 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 37.

The square root of 1283555440 is about 35826.7419674187. The cubic root of 1283555440 is about 1086.7714244464.

The spelling of 1283555440 in words is "one billion, two hundred eighty-three million, five hundred fifty-five thousand, four hundred forty".