1283978756 has 6 divisors (see below), whose sum is σ = 2246962830. Its totient is φ = 641989376.

The previous prime is 1283978747. The next prime is 1283978777. The reversal of 1283978756 is 6578793821.

It can be written as a sum of positive squares in only one way, i.e., 902401600 + 381577156 = 30040^2 + 19534^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160497341 + ... + 160497348.

It is an arithmetic number, because the mean of its divisors is an integer number (374493805).

Almost surely, 2^1283978756 is an apocalyptic number.

It is an amenable number.

1283978756 is a deficient number, since it is larger than the sum of its proper divisors (962984074).

1283978756 is a wasteful number, since it uses less digits than its factorization.

1283978756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320994693 (or 320994691 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 56.

The square root of 1283978756 is about 35832.6493019983. The cubic root of 1283978756 is about 1086.8908835553.

The spelling of 1283978756 in words is "one billion, two hundred eighty-three million, nine hundred seventy-eight thousand, seven hundred fifty-six".