1283994256 has 20 divisors (see below), whose sum is σ = 2573523900. Its totient is φ = 619859072.

The previous prime is 1283994247. The next prime is 1283994259. The reversal of 1283994256 is 6524993821.

It can be written as a sum of positive squares in 2 ways, for example, as 591462400 + 692531856 = 24320^2 + 26316^2 .

It is not an unprimeable number, because it can be changed into a prime (1283994259) 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, 1383151 + ... + 1384078.

It is an arithmetic number, because the mean of its divisors is an integer number (128676195).

Almost surely, 2^1283994256 is an apocalyptic number.

1283994256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1283994256 is an abundant number, since it is smaller than the sum of its proper divisors (1289529644).

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

1283994256 is a wasteful number, since it uses less digits than its factorization.

1283994256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2767266 (or 2767260 counting only the distinct ones).

The product of its digits is 933120, while the sum is 49.

The square root of 1283994256 is about 35832.8655845440. The cubic root of 1283994256 is about 1086.8952571325.

The spelling of 1283994256 in words is "one billion, two hundred eighty-three million, nine hundred ninety-four thousand, two hundred fifty-six".