1283440856 has 16 divisors (see below), whose sum is σ = 2406911640. Its totient is φ = 641597760.

The previous prime is 1283440841. The next prime is 1283440859. The reversal of 1283440856 is 6580443821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1283440859) 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, 41540 + ... + 65516.

Almost surely, 2^1283440856 is an apocalyptic number.

It is an amenable number.

1283440856 is a deficient number, since it is larger than the sum of its proper divisors (1123470784).

1283440856 is a wasteful number, since it uses less digits than its factorization.

1283440856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30674 (or 30670 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 41.

The square root of 1283440856 is about 35825.1427910623. The cubic root of 1283440856 is about 1086.7390845052.

The spelling of 1283440856 in words is "one billion, two hundred eighty-three million, four hundred forty thousand, eight hundred fifty-six".