1285318636 has 24 divisors (see below), whose sum is σ = 2571397920. Its totient is φ = 550687872.

The previous prime is 1285318577. The next prime is 1285318649. The reversal of 1285318636 is 6368135821.

It is a junction number, because it is equal to n+sod(n) for n = 1285318592 and 1285318601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173586 + ... + 180838.

It is an arithmetic number, because the mean of its divisors is an integer number (107141580).

Almost surely, 2^1285318636 is an apocalyptic number.

It is an amenable number.

1285318636 is an abundant number, since it is smaller than the sum of its proper divisors (1286079284).

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

1285318636 is a wasteful number, since it uses less digits than its factorization.

1285318636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13593 (or 13591 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 1285318636 is about 35851.3407838535. The cubic root of 1285318636 is about 1087.2688225917.

The spelling of 1285318636 in words is "one billion, two hundred eighty-five million, three hundred eighteen thousand, six hundred thirty-six".