1285583378 has 4 divisors (see below), whose sum is σ = 1928375070. Its totient is φ = 642791688.

The previous prime is 1285583371. The next prime is 1285583419. The reversal of 1285583378 is 8733855821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8733855821 = 20749 ⋅420929.

It can be written as a sum of positive squares in only one way, i.e., 1243761289 + 41822089 = 35267^2 + 6467^2 .

It is not an unprimeable number, because it can be changed into a prime (1285583371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321395843 + ... + 321395846.

Almost surely, 2^1285583378 is an apocalyptic number.

1285583378 is a deficient number, since it is larger than the sum of its proper divisors (642791692).

1285583378 is an equidigital number, since it uses as much as digits as its factorization.

1285583378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642791691.

The product of its digits is 1612800, while the sum is 50.

The square root of 1285583378 is about 35855.0328127029. The cubic root of 1285583378 is about 1087.3434671076.

The spelling of 1285583378 in words is "one billion, two hundred eighty-five million, five hundred eighty-three thousand, three hundred seventy-eight".