1283855978 has 8 divisors (see below), whose sum is σ = 1943782272. Its totient is φ = 635928556.

The previous prime is 1283855977. The next prime is 1283855981. The reversal of 1283855978 is 8795583821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1283855977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2999450 + ... + 2999877.

It is an arithmetic number, because the mean of its divisors is an integer number (242972784).

Almost surely, 2^1283855978 is an apocalyptic number.

1283855978 is a deficient number, since it is larger than the sum of its proper divisors (659926294).

1283855978 is a wasteful number, since it uses less digits than its factorization.

1283855978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5999436.

The product of its digits is 4838400, while the sum is 56.

The square root of 1283855978 is about 35830.9360469413. The cubic root of 1283855978 is about 1086.8562385006.

The spelling of 1283855978 in words is "one billion, two hundred eighty-three million, eight hundred fifty-five thousand, nine hundred seventy-eight".